The Guys and Dolls Law of Delayed Echolalia

Many years ago my brother and I went to see "Guys and Dolls" (this particular version had Lorna Luft in it, and maybe even a pre-famous Nathan Lane and his sidekick Ernie Sembella, I can't remember if it was them or not). Our parents passed the tickets off on us, since they were sick of seeing it. We got home, and my father goes "So, how was the musical?" "Oh it was good." Then, Dad starts immediately into the unsolicited opening lines of the show: "I got da horse right here, da name is Paul Revere..."

A few days later, we were talking to a friend of the family, also a big theater-buff. We mentioned that we went to see Guys and Dolls, and instantly he breaks into: "I got da horse right here, da name is Paul Revere..." This happened a couple of additional times, with other people.

Has anyone else observed this almost Seinfeldian effect with Guys and Dolls? If so, how far do they get past the "Paul Revere" line? Have I discovered a hitherto unknown Law of the Universe?