Related:

• Careful, careful--I might explode! -- Doctor Who, REVENGE OF THE CYBERMEN
• K'Vada: "Be careful, android! Some Romulan beauty might take a liking to you!
  Lick that paint right off your ears." -- "Unification I", Stardate 45240.6...
• Be careful when eating salmon - your fingers might become greasy.
• Be careful when throwing a boomerang - you might hit the back of your head.
• Be careful what you wish, it might come true.
• Lisa: Hi, Mr. Smithers. Smithers: Oh great. It's the Bobsey Twins.
  Well take your prying eyes elsewhere....
• Be careful what you pretend to be - you just might become it.
• Be careful when eating bananas. Monsters might slip on the peels.
• Be careful of reading health books, you might die of a misprint. -- Mark Twai