I promised I would show the two videos from the other night, (the rough-draft and the final draft) so here they are with a bit of explanation about how it all comes together.
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.