Not 18

Blondes take everything literally. My sister is a blonde. There was this movie she wanted to see real bad and she left with her ticket in hand to go see it, but I was surprised to see her return home in only 15 minutes. "I thought you really wanted to see that movie, what happened?" I asked.

"I did" she said sadly, "but, when I got there I saw a sign that said, 'under 18 not admitted' and I couldn't find 18 people to go see it with me."