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

What did the calculus student who failed his test and the guy who got a speed ticket have in common?

They didn't know their limits

What did the dash say when he failed his exam?

I underscored.

Poop Jokes More Poop Jokes

What do you call a guy who can't poop?

A constipatient

What did Noah do with all the poop?

Threw it overboard. it formed the UK. Taken from here: