Welcome rybijn! Since we're talking about forged checks at the water cooler...
Two forged checks walk into a bar. They sit down at the bar, and one gets stuck between the bar and the stool. Try as it may, it cannot pry itself free. The bartender says to the other check, "What's wrong with your buddy?" The check replies, "Oh, don't worry about that! It's just a bad counter fit!"
OK, groan freely, folks...