You know when your mum used to say “don’t put that in your mouth, you don’t know where it’s been”?

Well this story is about to prove her right!

John Stamos has revealed how a birthday prank on former Full House co-star, Bob Saget, spectacularly backfired.

The totally not-safe-for-work story starts ten years ago when Stamos threw Saget a party for his 50th.

As part of the celebrations, Stamos sent a limousine to pick up Saget. This is where things quickly go downhill.

Since he couldn’t be there for the trip, Stamos thought he’d send a 8×10 of himself in the limo along with a naked Dave Coulier.

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“Dave cuts a hole in my mouth on the 8×10. He places his thing through the hole and Bob’s nephew Adam takes a picture,” Stamos revealed to The Late Late Show’s James Corden.

“So then they pull up and I’m waiting for them in front of the hotel.

“They have this picture with the hole, I grab it from Dave and I stick my tongue through it.”

Of course that’s when they showed him the picture…

See we told you – sometimes mums really do know best!

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Photo: Getty

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