Personally, I think a gun is the best way to disprove bigfoot. And I have suggested this to many of the "Camp and Listen and Forget the Film" methodologists of bigfoot hunting.
The suggestion is, that when everyone is sitting around the campfire, someone stands up, displays his firearm, and proclaims
" THIS IS MAH GUN, IF I HEAR SOMETHING WOOD KNOCKING, I AM OPENING FIRE, IF I HEAR SOMETHING WALKING AROUND MY TENT, I AM OPENING FIRE, IF ANY OF THE TRIP WIRES GO OFF, I AM OPENING FIRE, IF ANYTHING PRESSES ON MY CHEST, OR I CAN HEAR ITS BREATHING, I AM GOING TO OPEN FIRE, OR SHANK IT IN THE CAROTID ARTERY WITH MY K-BAR (Displays knife)."
Needless to say, any and all bigfoot Shenanigans stop shortly after that.
PROJECTED FOOTER RESPONSE TO THIS SUGGESTION: "Of Course it stops, Bigfoot knows when you have a gun, and what's more, he probably heard your speech."