A man goes to a bar. He goes to the dance floor with three ladies. He says to them,

“If I guess the color of your underwear you have to dance with me.”

His shoe is shiny so he stuck his foot under the 2 of 3 girls and guessed the colors of their underwears correctly. When he stuck his foot under the third girl he asked her,

“Are you wearing any underwear?

She replied “No.”

He said, “Good, I thought I had a crack in my shoe.”