Instictively trying to use a technique in the wrong game.

[The Lugz]

After spending a lot of time building towers in Minecraft, you forget that crouching in other games doesn't prevent you from falling.

yep, i did that in portal 2 'i wonder what's behind there' splat

also, pretty-much any driving game i just follow the physics of the last one i played
so i slam into walls allot.

 

[Najos]

I do it a lot with MMOs. Playing a little Warhammer lately and everytime I switch between different characters I'll try to use the hotkeys for stuff. Really sucks when you're playing DPS and trying to use your heals.

 

[Jake|Ranger]

In Day of Defeat, I use space bar for sprint. And in Counter-Strike I use space bar for slow walk. On more than one occasion I've tried to sprint past the double doors up to bomb site B in de-dust2 only be slowly walk and get owned by a terrorist.

 

[Thetwistedendgame]

Every game should have double jumps...

 

[asam92]

I'll go one better, I tried to click the right thumb joystick that wasn't even in my hand and try to look behind me cuz I had been playing too much GTA San Andreas that day.
As for in game, I may of done it a few times, but nothing I really remember.

 

[silasbufu]

I tend to jump like a retard because of the reflex gained in Morrowind, for increasing Acrobatics.

 

[Raddra]

Trying to do a dodge forward roll (batman AA) in Mass Effect

Trying to block (Champions Online) in Everquest 2

 

[TheMagicIndian]

Holding shift to creep over to see what's over an edge only to fall to my death in any FPS. Damn you, Minecraft...

 

[Deadlock Radium]

Fast switch-spamming between two weapons, like in TF2 (Rapidly pressing Q while running, for teh lulz), in CoD4 Multiplayer on PC. I looked like a spastic guy with a tendency to always lean left. It was annoying, but I couln't stop .____.

Also, playing the SC2 Terran Campaign after playing 20 or so Protoss Multiplayer games in a row.
I have called down more MULE's than I have ever made Probes...

 

[thahat]

Switching forward through the Halo series is quite awkward, especially trying to melee with B or reload with X in later games.

Otherwise not much of a problem, as apart from GTA cheats my muscle-memory is rubbish

and switchinf forward from halo you will probably have noticed your aim has turned to putty. XD
thats the effect halo had on me anyway. have to play a LOT of other FPSs to get it back up to scrathc XD ( damn you halo and your spray and pray attittude, you bullet sponging, and collorfull cvollorfull people XD

 

[MrJKapowey]

The CoD / Bad Coy knife / 'nade problem.

I kept trying to grapple around the Vatican in Brotherhood after too much time on Just Cause 2.

Trying to use R-mouse to do something special with my 37mm cannon on WoT - DAMN MINECRAFT!

Blowing myself up on BFBC2 'Nam. In the main game I always have the binoculars as my Recon ability (to call in mortar strikes) and that's always L-Dpad. In 'Nam it's ALWAYS TNT = L-Dpad and Binoculars = R-Dpad. Cue much left trigger to bring up binoculars (place TNT) then right trigger to begin calling in a barrage (Detonate TNT).

 

[Loki Cain]

I press Shift so i wont fall off an edge... jeez this gets me killed at least once a week.

 

[Your Fearless Captain]

Trying to play Minecraft after playing Fallout 3. I had to re map the inventory to tab.

 

[DSK-]

Playing NFS:MW and I am just about to crash when I instinctively press my UT2004 shield gun bind, realise it wasn't working and then just spam it to no avail before realising that I was playing the wrong game >_>

 

[putowtin]

I tried to enter V.A.T.S. before remembering I was playing Just Cause 2, once.

I can't tell you the amount of times I've done that!
Oh and running toward walls and wondering why I don't automatically go into cover

 

[James Crook]

I tried to enter V.A.T.S. before remembering I was playing Just Cause 2, once.

High-five! Just THAT got me killed very often. Not to talk about the moments I forgot I could pilot anything and had a grappling hook.

 

[Sizzle Montyjing]

Ooh, probably Black Ops, i forgot i wasn't playing a game that encourages anything other than 'Run in, Use FAMAS'
Also i keep on trying to free-run in COD, after copious amounts of Brink.

 

[Reaper195]

I spent a weekend playing nothing but Prototype and the Infamous games. Then I went and played GTA 4 and was all "*Jumps off building* Hmm..........OH SHI-"

 

[THEfog101]

Like crouch jump? i played half life too much as a kid.

 

[Vault101]

Infamous I really just wanted to melee everything, because ti seemed natural and I found aiming tedious