My four or five posts of possibilities were deleted.
I think they are very related to the topic of this thread.
Since the OP left before the water drinker: maybe,
a) her hubby was drinking with buddies and she was giving him a ride home.
b) she left a $50 tip.
c) maybe she got there very early and had food with friends
d)
I'm old, I can't remember all the possibilities I posted.