I thought of this one and am seriously considering making/selling them:
IF YOU CAN'T SEE MY FINGER, THEN I CAN'T SEE YOU
other favorites of mine include:
CHRIST IS COMING - LOOK BUSY
DYSLEXICS, UNTIE!
and one more that I thought of, but would never have the balls to actually print:
IF JESUS LOVES ME, WHY WON'T HE SPEND THE NIGHT?
going straight to hell,
-Peter