so here I sit in an opening and just before shooting time I have woodies,mergansers etc just falling in. After the sun comes up everything is just turning away. Open the top on blind to see if boat numbers or something is spooking them and lo and behold.. Some butt wipes have thrown 1 liter sprite bottles up on the vine canopy behind me that I couldn't see coming in. Wasted a half box of shells dispatching them.