Annual reg servicing sometimes slides to um!! more than a year.
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7. Way back before I ditched the snorkel I descended while still breathing on a snorkel... fun.

Thorough buddy checks.
I certainly don't do it all the time. Mostly, everyone gears up and we get in, make sure we didn't trap the long hose, do bubble checks, and dive.
This was one of the reasons I started the thread. Even people who are trained the way you and I are, let things slide. I had to take a buddy to task for not going through the checks before a Tech 1 dive the other day. It wasn't much of a dive for him, but it was for me -- and safety shouldn't be depth dependent!
At the risk of subjecting myself to yet another classic SB evisceration (and it wouldn't be my first), I will openly admit that my husband and I don't do buddy checks to the degree that we used to. We know each other's gear so well that we don't need to do the whole BWARF sort of thing - I know where his weights and alternate air are and vice versa. We do at least always ask each other if our air is on, and sometimes we'll remind each other to put air in our BCs before we giant-stride off the boat, but that's about it.