the t-quilizer shirt??
and ive seen a couple i like.  Most of them are plain and simple but make me chuckle
"this is my party shirt" ( not really funny just simple)
"Drink 'til you like me"
"this is my kegstand shirt" ( written upside down for obvious reason's)
" 1 Tequila, 2 tequila, 3 tequila, Floor."