hahah muggers are funny but they're useless.
Muggers come in handy!
One thing I like to do is if I'm in a standoff with someone, let's say dude is around the corner waiting for me and I'm behind a wall waiting for him, both of us waiting on the other to make a move. Often I'll call a mugger on the dude who'll come behind him and mug his ass catching him off guard. Usually the guy falls to the ground. That's your chance to run up on him and go Rambo on his ass haha
Another useful trick but really hard to do (I've done this twice successfully) is if someone is in a tank. Here is something I did last week:
Dude killed me like four times in a row with a tank. I made it to my apartment. I sent him a PSN message of jibberish, I said, "who you know when if?". Immediately I sent a mugger, and turned on the TV to watch him. I see his tank suddenly goes idle, he's responding to my message. I get a "huh?" message and as soon as I see that a mugger climbs up on the tank, pulls him out and throws him on the ground lol. Dude starts chasing the tank on foot and the mugger is driving and runs him over and kills dude. Funniest shit ever. It's hella hard to pull off for one you gotta do it fast and two it's pure luck if the person responds or checks their message.