One day I was helping a customer at work with some questions about computer mice.
She wanted to know about the differences between an optical mouse and a regular mouse.
I picked up the regular mouse and showed her the little roller ball thing underneath and explained that it was the part that made the pointer move, etc.
Then I picked up the optical mouse and as I turned it over I said, "But not all mice have balls" and got no further as I realized how that sounded. Luckily the customer thought it was funny and started giggling. OOPS!!!

Oh, and she did buy the "neutered" mouse, lol!

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