Several people have mentioned the "calls of nature", ie pissing out of a high seat.

I thought it was an absolute NO-NO to do anything like this near a stand or a high seat. Either using a bottle or leaving the area by a good distance. Nothing would scare away a game animal quicker than human urine. Try it oneday on a game path and see the results.

A bottle is OK, but ask Bakes how some of this working compatriots use alfoil.