A mate in California owned a Citabria. He told me this tale and I couldn't stop laughing. He said he took off from Wasco with his 19 yr old son on board, and headed inland to the Mid-West.
Of course, he had to climb to serious altitude to clear the Southern Rocky Mts. He told me he got to 12,000 feet, and his 19 yr old son comes out with -
"Oooh, Dad, I gotta go! - with a number 2! I shouldn't have had that big greasy hamburger just before we left!"
And Dad berates him with, "It's taken me 20 minutes and a heap of fuel to get to 12,000 feet!! - and you want me to put down now for a number 2, just because you didn't go before we left!?"
"I'm not putting down for that! You can go in a plastic bag!". So Dad hands him a plastic shopping bag, and Son dutifully lays cable in the bag (I can't even imagine how you'd do that cleanly in the back seat of a Citabria, but apparently he managed it).
Mate regaled me with, "STINK!! Gahd almighty, I nearly puked with the STINK!! It clung to everything!!
So then they managed to get the bag out of a window - whereby it promptly tangled around the tailplane!! Mate told me, "Gahd, I had to do some of the fanciest ahr-o-batics like you never seen, just to try and shake that damn bag off!!"
"Ah thought the son was gonna puke then, after them fancy ahr-o-batics! That would've been as bad as the number 2!!
"I told my son, he ain't never coming with me again, unless he's gone at least twice, before we take off!!"