Bensoning

The act of spontaneously breaking into musical-esque singing and dancing in everyday conversation for no reason whatsoever.
One who performs these acts is known as a "Benson".

Bro A: How'd that date go last night?
Bro B: It was pretty good, until I turn around and she's Bensoning all over the place.
Bro A: Like full-on Bensoning?
Bro B: Yeah, it looked like I was on freaking Broadway.