I found this super mutant last night that gave me a laugh. Go to Westside (Entrance is near The Thorn) and look for a super mutant, then talk with him. Listen real closely, and turn up your volume a bit. I'm not gonna ruin the surprise if you don't know what I'm talking about, just go have a look see, takes just five minutes to do.

He wasn't hard to miss, in my first playthrough. I just wished he had a larger role. Maybe even a companion opt. Any would be better than Granny or the other mutant, who's name escapes me for obvious reasons.