Originally Posted by
Xefas
The Jugs of Water puzzle from Diehard 2.
"Before you is a 5 gallon jug, and a 3 gallon jug." says the wizard's illusion in a rather condescending voice. "You must set exactly 4 gallons of water on the pressure plate, or everyone in your party is going to learn the true meaning of '15d6 piercing damage'." The wizard's illusion turns a small illusory hourglass over. "You have 2 minutes, gentlemen".
*The DM clicks a stopwatch "You have 2 minutes, gentlemen"*
If noone in your group has seen Diehard 2, it's quite hilarious.