How do you fail a urine test with a clean sample?

Poop in the specimen cup.

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Fail Jokes More Fail Jokes

Why did the Buddhist photographer fail at taking pictures?

Bad cam'ra

Why did the math student fail his exam?

He needed to sketch the sine and cuisine graphs but only knew how to do cos(-x)

Poop Jokes More Poop Jokes

What did Captain Picard call his poop?

Captain's log

What's brown and rhymes with poop?

Snoop Dogg