Quote from Adrian Monk in Mr. Monk Stays in Bed
Adrian Monk: It's not straight. Natalie: Ha! The bubble's right in the middle. Adrian Monk: The level's broken. Natalie: The level is not broken, Mr. Monk. It can't be broken. It's a bubble on a stick. You have two levels? Adrian Monk: I use this level to check the other levels. It's my level-checking level. Julie Teeger: How do you know that one's not broken? Adrian Monk: That's a good question. I take my level-checking level to the hardware store twice a year to have it recalibrated.