If you are infected with bear AIDS, from any commonplace bear, you will in fact turn into a Werebear, and your facial hair will grow extremely fast, once a month your will turn into a bear; when there is no moon, and you will have the opportunity to ravage the townsfolk with your furry muzzle.
Tom: "Wow, what did Ross do with that grizzly last night?"
DAVE: "I dunno, but I think he got bear AIDS"
Tom: "That's cool i guess."
DAVE: "No dude once a month he becomes temperamental and goes to town and kills folks."
Tom: "Oh well F*** that Sh!T!!!!