Props to Jimmy Fallon for heading straight to comedy gold on his second night as host of NBC's Tonight Show, with a stirring cover of R. Kelly's "Ignition." Not strictly barbershop, not safe for work, and not likely to appear on a contest stage - -- and great for public awareness.
Make use of it: next time someone says, "Barbershop? You mean like Jimmy Fallon and Justin Timberlake, or that R. Kelly number? That was funny!" say, "Yes -- barbershop! Great fun to sing." Then sing with him. Don't defend, don't accuse -- sing.