I had to wait to get upstairs to post this on my computer. (It's that thing about Locals not being able to post longer videos by phone.)
This is the gag that I've been doing at the end of my show- it's different every time because I'm working it with local guys. But these guys had to be the best so far- with no rehearsal they pulled off the "heckling barbershoppers" routine. And their singing was great too. Have a look.