"Severe headaches" joke

one day there was a man that was having severe headaches. when he went to the doctor the doctor had told him that the only way to get rid of this pain was by cutting of his balls. the man said was uneasy about it and didnt want to but then his head started hurting again so he cut them off. he was feeling so good after that that he went to buy himself a new shirt. as he walked into the door the clerk said " size 30"
the man said "how did you now?"
the clerk said "ive been doing this for 10 years, i know these things"
so the man bought the shirt. he was felling so happy about the shirt thatt he went to buy some socks.
again when he walked in the clerk said "size 12"
"how did you know?"
"ive been doing this for 20 years, i know these things"
the man felt so great about his new socks that he went to buy some boxers
when he walked in the clerk said "size 30"
"nope, size 28!"
"are you sure? i think its size 30"
"yep. im sure. all my boxers are size 28"
"i dont know... ive been doing this for 30 years and i know that if boxers are to tight your balls squeeze together and you get severe headaches"