A/n This is my second favourite, but JJJS (the hobo) and his Spork Julius, love it, almost as muck as JJJS loves Ikea stuff. And also a trick I would love to do next time I have to go to hospital.

37. I must not drink four litres of blue food colouring just before my annual school check up (pee-in-a-cup). - Fred Weasley
38. I must not drink four litres of purple food colouring right before my annual school pee-in-a-cup. - George Weasley
39. My whole family that are still students must not drink any amount of food colouring before the school pee-in-a-cup. - Ron weasley

There was a large line stretching from the doors of the hospital wing to the entrance to the great hall. This could only mean one thing, Hogwarts check-up day. This was the day Madam Pomfrey made the whole school donate a sample to check their insides were okay. It was Fred Weasleys turn.
Madam Pomfrey simply handed Fred the cup and pointed at the hospital bathroom. He was out in less than a minute, and with a worried expression handed the cup to Madam Pomfrey.
She gasped "what have you done?" worriedly at the boy.
He simply smiled and said "what, It's not meant to be blue?"
McGonagall, who had been stood in the open doorway, keeping an eye on the children, briskly marched over, took one look at the sample and said to Fred " detention, you will make time, because you tried this trick some years ago when you started being sick in my classroom, in a rather luminous orange may I add."
Fred mock saluted and army-marched out the door.

As they were lined up alphabetically, George was next. Madam Pomfrey gave him the same treatment, only stopping to ask "Is there something you should tell me?" looking George straight in the eye.
"Well, I had four slices of toast, some eggs, a banana and some pancakes for breakfast, and I like the colour purple. Anything more specific?"
"Have you eaten or drunk anything that may affect this test?" she asked, sighing.
"Well I suppose we'll just have to wait and see." he replied, before waltzing into the bathroom.
He also came out in under a minute, although his cup was a very vibrant violet. In fact it looked remarkably like Weasley Wizard Wheezes' staining solution.
Madam Pomfrey glared, and said "Your family are the only ones that make this difficult, go and get your detention."
Instead of marching like his brother George chose to waddle like a penguin keeping hold of an egg, McGonagall didn't have to say anything, just hand him the detention slip. So he continued his waddle to the great hall, where lunch was being served.

Next in was Ginny. She received her cup with a smile and scurried into the toilet. She soon came out, dropped the cup near Madam Pomfrey, and strolled out the hall. Madam Pomfrey took one glance at Ginny's cup and shook her head. The content was a well thought out, glowing yellow, that's how she knew she couldn't get a detention.

Finally it was Ron. He walked in and repeated the process of taking the cup and going to the bathroom. He came out, put down the cup, in which the content was that of a psychedelic rainbow. He also got handed a detention slip, along with a stern glare as he walked to the great hall.

A/n that felt really short, but I have a lot of German to do so enjoy! Also a shout out to Linnup, who always reviews (hint hint) and is generally uplifting.