[True story...] Me: *Finishes delicious breakfast at small airport diner. Walking back to plane at tiedown. Sees guy getting out of 172 walking toward me...* Me: "Good morning!" Other Pilot: "Beautiful morning. Going to get me some breakfast!" *Pats stomach* Me: *...Don't say it, don't say it, please please please don't say it.....* Other Pilot: *Rubs stomach* "Gonna have to do a new weight and balance after this!!" Me: *facepalm* "Yeap."
It's really, really hard not to make that joke. So, I agree, it is definitely the dad joke of aviation. Reminds me of another one I heard, something like "It is impossible for a man to finish tying something down in the back of a pickup truck, crank one more time on the tie down strap, and not say "well, THAT's not going anywhere!", which made me laugh because I'm pretty sure I say, or at least think, that every single time.
Dad - *Sees another dad walk in to a restaurant* Kids - *Don't say it, don't say it...* Dad - "Well! They let just anyone in here these days!"