An old classic
A cargo plane is flying along, doing its cargo plane thing, when a fighter jet comes up alongside.
The fighter jock decides to poke some fun at the pilot who's forced to fly such an ungainly vessel.
"My plane's so much more advanced than yours. Watch this" says the jock, as he proceeds to do loop-de-loops, barrel rolls, corkscrews, and all manner of fast paced aerial acrobatics.
"Very impressive," responds the cargo pilot. "But that's nothing, watch this." For a half hour the large craft simply plods along straight as an arrow, not even so much as dipping the wings.
After a while, the cargo pilot comes back on the radio and says "So, what'd you think?"
Jock: "What d'you mean? You didn't do anything. You just flew straight for a while."
Cargo: "Oh no, that wasn't all. I got up, stretched my legs, got some coffee, went to the bathroom..."