I know we do these threads all the time, but I just remembered one today that drives Wagon Sr. crazy.

When I have a bottled drink, I can never finish it. I always leave about 2 gulps worth at the bottom of the bottle. There's always bottles with just a tiny bit of liquid left at the bottom all around our house. It's not the backwash thing-- I've examined myself and figured out that I like to leave some just in case I'm still thirsty and want another sip. I don't want to be left without any drink left to sip if I want another sip. But I never take that sip because I don't want to run out, so I don't let myself take those last few sips!