Regel van drie grappen

Three signs you're getting old: 1. You get excited about a new sponge. 2. Your back goes out more than you do. 3. You choose a restaurant for its parking.

Three things I'll never understand: 1. People who talk during films. 2. People who clap when the plane lands. 3. Lists with only two things in them.

An engineer, a physicist and a mathematician are staying in a hotel when a fire breaks out in the hallway. The engineer grabs the extinguisher and empties the whole thing onto the flames. The physicist calculates exactly how much water is needed and uses precisely that amount. The mathematician looks at the fire, looks at the extinguisher, and says, "A solution exists." Then he goes back to bed.