sometimes, like i don't tell my mates that i enjoy playing Pokemon (since the last guy who mentioned playing Pokemon near my mates was ridiculed mercilessly for it), however i do wear some Gaming shirts around them and make conversations about games like TF2, Portal and Half-Life 2 with them (although they usually are about my mates saying that MW2 is the best game around, me mentioning those games and them saying they are crap without playing them).
plus i have quoted Yahtzee on occasions, but that doesn't count since none of them know who he is.