I can't copy it onto this site, but I got the biggest chuckle out of a cartoon a friend sent me the other day.
Jesus is teaching a crowd of people about God's plan for forgiveness and is telling them that God wants his people to forgive those who offend them "seventy times seven". A guy in the crowd slaps his forehead and says, "Oh great! Now I have to be able to do math too?????" hahaha