So I don't see these relatives often. I go over once a year on christmas and may see these people 1-2 other times a year. This doesn't matter but even though they're in my family i've always been the awkward younger one who other than maybe a hello or goodbye don't talk too much at these things.
The obvious solutions would have been to try to get it to work, tell the hosts because this isn't that weird, or even just leave it there would have been better than throwing it in the bin or the bin outside. When this happened I was embarrassed at first, then I thought this was funny. But I was also annoyed because this area of the house isn't restricted(never has been, just nobody who uses the downstairs came this year[small bar, pool table]...most attendees are older and cannot walk down steps), there should have been some advanced warning about the toilet not working. But my actions are my actions, so I am not trying to defend anything even though my original post was written as if I didn't care.
Ultimately this was a horrible thing to do and I cannot deny it, but if this was a scene in some sort of comedy movie I'd probably laugh assuming I wasn't played by Rob Schneider or David Spade.