In Sonic 2, I almost always rev up the spin-dash at the results screen and let go just as the screen fades out so it looks like I'm transitioning from zone to zone. :v:
I do this stuff too. Also, when I spin dash, I move my whole hand so I can use three fingers to hammer A B and C and rev as much as possible.
Hey, I do that, too! Since I'm using a keyboard, I press A, S, and D a lot so that I can have the fastest possible release.
Yeah, come to think of it, I may have started doing it back around the time I discovered the Sonic 2 Beta and had to use a keyboard to play it.
I tend to play a game the exact same way I played it the first time if I haven't come back to it in a while.
Whenever I'm in any sort of section where I have to wait around, I tap down as fast as I can to make Sonic repeatedly crouch and uncrouch. Don't know why; it just looks funny.
If I'm in a waiting portion of the game (ie Marble Garden Act 2 at the end of the earthquake sequence) and have a fire shield, I hold my turbo button down and just flame dash all over the place like a maniac. Actually discovered a few weird glitches/game freezes this way. I also rev up and spindash away at the end of each level in Sonic 2 - as someone said, it makes a satisfying sound that leads nicely into the next level. At the apex of every single little slope in the goddamn games, I jump now. I can't do Chemical Plant Zone without jumping and rolling to gain momentum on the bendy roads until I'm going at terminal velocity.
I had quite similar habit, but I'd prefer just to crouch with my character. Ignoring some practical advantages of this - I liked how it looked like especially in Sonic 3, when there was Tails near you - it looked like depressed owner and some cheeky dog waving his tail(s) nearby
In SA2, I found myself almost always somersaulting before jumping to make Sonic do that cool little flip. 90% of the jumping I did in that game was in this way. Also, in Sonic 1 I tend to try and jump mid-loop to squeeze extra speed out of Sonic.
I always, without fail, jump over the goal posts in Sonic 1/2/CD rather than just running past them. I can only assume this habit started because of getting the bonus points in Sonic 1, but I've just kinda stuck with it to the point that I even find myself doing it in Generations as well =P
I too do this, and what I've always noticed with Sonic 1, is that I tend to do a "reversal jump" kind of thing (Jumping, then tapping the other direction, so the animation is flipped). In Sonic 2, I tend to jump from one side of the capsule to the other side as many times as possible while the end tally plays, just to see how many times I can do it before the level fades out.
I do every single one of these. I also: try to play as smoothly as possible moonrun by moonwalking into springs jump in between spikes in Green Hill get hurt by Robotnik after hitting the capsule in Labyrinth complete Sonic 2 without getting wet always do the Oil Ocean glitch that messes up the physics collect every ring in Sky Chase (mostly out of boredom) make the characters enter a running animation instead of their victory pose whenever possible glide backwards as Knuckles whenever possible make AIZ2 music play in AIZ1, and vice versa kill Tails in AIZ to make him activate the capsule hit the Eggman monitor in HCZ play Sonic's MGZ and CNZ bosses as Knuckles don't let the CNZ miniboss destroy any blocks play the wrong bosses in ICZ do the white water glitch in LBZ kill Tails with the door in MHZ skip the FBZ miniboss use the scroll-glitch to get through every door in Sandopolis even when it's quicker to use the switches fetch a drink during the LRZ boss do nothing after Eggman leaves in the HPZ cutscene so Sonic's finger pointing syncs with Knuckles smashing the wall hump Knuckles while waiting at Sky Sanctuary make Knuckles wave afterwards ignore special stages in Sonic CD and get Good Futures in every Zone instead visit the statue that gives you rings But a lot of those could be summed up as "break the game whenever possible". I still haven't gotten the Achievement in Sonic 3 (360) for completing Ice Cap, despite having the rest, including the one for completing the game. EDIT: Can you believe I forgot a couple?
It's probably been said already, but something I like doing a lot is making Sonic dance to the background music. Most of the time is because I'm waiting for a platform or whatever, but other times I do it because it just looks funny.
Add me into the "fake transition" camp for Sonic 2. I also like to play "doge tails" on Act 2 levels. I win if the stage transitions and Tails is either facing the other way, or wouldn't be able to reach me doing whatever he was doing when the screen froze. I also have a specific habit for ARZ. I like to jump in the water and follow the entire underwater route without grabbing a single bubble.
Trying to get as many hits in as possible on Sonic 2 Robotnik's weather machine. Can get three hits in a row before having to go through the pipes which leads to loads of graphics glitches due to the number of yellow clovers on the screen at once. I die so many times due to me being cocky but can't resist doing it.
In Sonic 2 and S3&K I always position/trick Tails so he gets crushed by hazards. Like crushing him with the Nut and Bolt "elevator" in Metropolis Zone. Dunno why, I always found it funny. :v: