Several years ago I came across this company and instantly became a fan. I am, on most occasions, quite sarcastic, so these are RIGHT up my alley. Plus, at work there are motivating calendars at every turn, so I like to see people's faces when they actually READ mine. Maybe not the most professional in the world but I love them!
Here is one of my all-time favorites:
And this one just made me laugh out loud!
Head on over... despair.com.