Changes by last author:

Strong Bad was born with boxing gloves for hands? Where'd you hear that? That's kinda cool... sunnythehamstar

Well, they never say it, but it's implied in Some Kinda Robot. --Dark Grapefruit

Also, in StrongBadEmail/sb_email 22 they said in the newspaper that Strong Bad was "an odd little bloke with a Mexican wrestling mask for a head and boxing gloves for hands." -Shopiom