Venus

My dad has false teeth. At night, he takes them out. His pronunciation isn't too great without his teeth in. Vs sounds like Ps, depending on the word he's trying to say.  And, so on...

One night, years ago, my dad had come in from putting out the trash and remarked:

"Gee, Penis sure is bright tonight."

Naturally, my mom and I giggled and said: "WHAT?"

Dad: "Penis! The planet. It's bright tonight."
Me: "Oh!!! VENUS. Venus is bright tonight."

I assure you, much laughter ensued.