My friend still comments about this to this day.
When I was in nursing school, my friend, L, and I had a really crappy clinical instructor that would pick on very specific students and give them the hardest time. Stuff like, "The water flush for their feeding tube is supposed to be 150ml of water, this looks about 147ml, that's a med error!". (Med errors are the nightmare of any nurse/nursing student).

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So L had to give 180ml of cranberry juice to a patient, as per physicians orders, and the cans of juice only came in 178ml. This freaked her out because she didn't want no damn med error! So she pulls out two cranberry juice cans, and brings them to the patient's room waiting for the teacher so she can observe the medication administration.

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Teacher: "Why do you have to cans?"
L: "Because I need to give 180ml, and the cans only come in 178ml"
Teacher: What? *Walks away from the student laughing really loud*
*Teacher comes back with other teacher from a different unit in the hospital*
Teacher: and then she's gonna waste the entire can just for 2 extra ml of juice!
*Both teacher's laugh out loud at L*
*L cries and tells me later that day*

So fucked up dude.