Not sick but two pranks I remember, a friend came over from London and we always used to take the piss and give him plenty of abuse, I rolled a nice fat cone and packed the roach end with 4-5 caps from a cap gun, we all passed it around and he could see us smirking but didn’t suspect that as we’d all had a puff, anyway it shit him right up and he got in a right strop and stormed off about half hour after arriving.
Another friend while passed out we completely ‘gimped’ head to toe in black vinyl. Just for good measure we bound his legs and feet together and gave him a pair of gimpy vinyl lobster claws so he couldn’t undo anything, watching him wriggle around the next morning was hysterical.