Shopping.
I am embarassed to admit that was a family member!
And if it is in FRA then I could see lost in the hellhole that is FRA. (Edited to add - I didn't even read in the OP that it WAS FRA - just my ongoing feelings about FRA, and once again it was the culprit)
And today I didn't intend to, but fell asleep in a lounge and almost missed my flight.