You were bitten by a radioactive what?

Traditionally, there are four or five ways of gaining superpowers. You can be born with them, like Superman or the X-Men; you can be granted them by forces beyond our comprehension, like Captain Marvel or Green Lantern; you can gain them through technology, like Iron Man or Doctor Octopus, or you can gain them in a scientific accident, like The Hulk or The Flash.
As we all know, Peter Parker gained incredible spider-like powers when he was bitten by a radioactive spider.

With that in mind, I can only say I hope this fellow isn't going round biting people.