I finally quit skipping the buddy check and it caught a leak.
I used to think buddy checks were a waste of time on routine dives. But after a close call where my regulator failed, I made a rule to always do them. Last month, during a harbor inspection, my buddy spotted a tiny crack in my air hose. If we hadn't checked, I might have run out of air at 30 feet. Now I never skip it, and it's become second nature. It takes two minutes but could save your life.