I’m not sure if this is a good lesson or not. I think the least is “the distractions are valuable, and maybe it’s what you should have been doing in the first place!
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.