Threadless

 http://www.threadless.com/product/467/You_ve_Got_Some_Splaining_To_Do/tab,guys/style,shirt

   You got some splaining to do.

I like the joke in it, its also cute in some weird way.

http://www.threadless.com/product/2533/I_X_Tinman/tab,guys/style,shirt

       I [X] Tin Man

I was sick of seeing I <3 t shirts everywhere and this shirt makes fun of it.

http://www.threadless.com/product/1306/Lemon_Aid/tab,guys/style,shirt

Lemon Aid

I like it because it is the literal meaning.