I've caught my wife doing this on numerous occasions. The typical scenario is we'll meet after work someplace for dinner. I'm on my bike and she's driving. So we head home separately and she arrives first. But as I'm putting the bike away, I see a light turning on behind me and it's her climbing out of the car.
I've seen this also at fast food parking lots and it puzzles me even more. There's a guy just sitting there not eating or doing anything. Did he eat already? Was he not hungry and but his partner was so he's just waiting for them?
Last time I saw one of these guys as I was entering the restaurant. I ate my lunch and sat around for maybe 20 min because I prefer not to cycle again immediately after eating. Then I come out and the dude is still there, staring off into space.
Heh yeah. I've asked her on a few occasions and she looks embarrassed and gives me a different answer every time. I figure she just needs a moment and so I've stopped prying.