Waaaay back in 1972, I got into dulcimer making thanks to Bill Bland in Tucson. He was interviewed in the Tucson Daily-Citizen about his musical instrument store and he talked about his dulcimers using what he called "The Shadetree Guarantee:"
This won't rip, run, rag, bag, sag, wheeze, sneeze, fall out at the knees, or smell bad in hot weather.
I thought this was great schtick and committed it to memory. (And thank you, Bill, for that and for many other musical gifts in my life that keep on giving!)
Fast forward about 17 years to one of many computer swap meets, where I was selling carloads of floppy diskettes. I used the Shadetree Guarantee, rattled off at speed, as part of my schtick to drag in customers. One woman liked that and responded with this (also at speed):
Won't rust, bust, gather dust, wrinkle 'round the edges, bend, break, or tarnish; good for coughs, colds, torn assholes, corns, calluses, and bunions, and it's waterproof, too!
This cracked me up and nothing would do but that I had her write hers down. (She got me to write my schtick down for her as well.) And I believe I even was able to sell her diskettes, so it was a perfect deal.