OMG KEVIN! I WILL SEND YOU A HAND DRAWN, PERSONALIZED, FRAMED AND COLORED DRAWING OF CHRISTMAS DICKS (not with high lighters and on legal paper) IN EXCHANGE FOR ONE OF THOSE MUGS!!!!!!!
My favoritest ever is my former boss' mug of a waddle/colony/whatever penguins doing the nasty. You can't tell they're doing the nasty, at a glance it's just a bunch of penguins hanging out, but once you look at them more closely you can tell they're doing "it." I snuck it to clients on occasion just for the heckuvit.