Standing on a medical kit or taking cover for a minute should heal any injuries.
You aren't able to climb objects, even ones with many visible good handholds. You have more chance of walking through them.
You can't attack before it's your turn.
When reloading you can save all the ammo you had left, with no extra cost to time.
Everything fits nicely in your pocket.
-Your pocket will never bulge
-The limitations on what you can put in your pocket are based on weight, not size.
Money has no weight.
You can look down at the wall behind you without seeing your legs.
In a fight there must be some invisible imp running around with a bucket of red paint because there is no apparent source for the large amounts of blood decals... I mean splattering the place.
Attacks damage the opponent's HP... Not their avatar - Duh!
There is a creator.
-He/she is laughing at you
-It probably amuses him/her to think how many obstacles they put in your path.