The old Kingairs had those pee-tubes with a funnel attached at the top, remember? Great for catching flies with in the cruise, too. Top of descent into some-or-other war-torn African paradise years ago, and my stomach lets me know it's now or never. Just made it to the back in time. 10 pairs of local eyes watched the unexpected comedy-show with great and undisguised interest (no cubicle, curtain or anything of the sort) as the Umlungu captain dropped his britches in anguish and splutteringly vacated his bowels into the tiny hissing funnel in the back of the bucking aircraft. Aah, happy days...
Seen much, much more interesting/hilarious/outrageous in the bizjet-world, sometimes involving very well-known personalities, but those stories shall remain resoundingly untold, discretion being a large part of the job these days