The subject of an itch.com will normally seek to justify symptoms on banal and unrelated causes. See "wishful thinking".
Friend: that's awesome, dude! What was it like?
Victim/dumbass: it was great... Strangest thing is, I've been pissing blood ever since but I figure it's prolly because I drink tomato juice, or something...
Friend: errr, listen bromosexual, I think you got hit with an itch.com. You should probably get your ass to a sex clinic. Don't worry, push come to shove I'll totally do right by your sister when she comes of age.