Almost climbed into the T-34 without an SV-2 on once (we were required to wear them in Corpus). Got that "something feels wrong" feeling, looked down and saw the IP laughing his ass off and pointing to my SV2 on the ground underneath the horizontal stab.
I did that same thing on my second offwing flight with the XO. I noticed it and unstrapped and hopped out to get it. Turns out I wasn't the first one to do that with him.