Sat out in the yard 3 nights calling for coyotes last month. First night I chamber checked. Second night I chamber checked. Third night I thought to myself "What are you doing, you've loaded thousands of mags at speeds without issue, just drop the bolt." So I banged the bottom of the mag and dropped the bolt. A few hours later when I got back inside I dropped the mag, racked the bolt and... nothing. No round in the chamber. "Doh!"2) during admin load out, after a full rack, quarter rack to check that the first round is indeed chambered, then use forward assist to ensure it is indeed locked in battery
I was SHOCKED that I didn't see anything that night, normally that'd be the perfect time for the universe and it's sense of humor with me.