Getting mayonnaise on anything made of Sims Navcom material. Wife through a napkin in the back seat after making us some delectable sandwiches. Landed on my bow, but I thought nothing of it. Next day my Alpha-Shox dripped off the bow like they were made of bearing grease.
Giving your hunting partner 4 blade broadheads to test night before a turkey hunt. Sorry buddy!
One of the biggest mistakes I've made multiple times - Forgetting to practice with new rainwear before season. Along with that would be not cutting off the cords Sitka Gear attaches to their zippers. Seems even if I practice and have no problems they always catch the string when an animal is the target!!
Not marking your string where the peep sight sits. Peeps catch on all kinds of stuff. Doesn't take much to through the sights off.
Not packing extra batteries for your rangefinder.
Seeing a 180 class buck run into a small bush. Seeing antlers as the animal comes out of the bush and assuming it is the same one that entered.
Thinking that larger bodied muledeer with 25" high antlers can't hide in 12" tall sage brush
