Man, these things are annoying.
Good thing I have the Chicago Typewriter. Before that when I didn't absolutely have to kill em, I would just blow one of its legs off and run like hell. The FIRST time I ever saw one of these scared the piss out of me. I used about 6 grenades and used up all my TMP ammo. By the way, the bag r0xx0rs your s0xx0rs.