I looked down at said ticket after I went into the theatre, and I noticed the word "Student" emblazoned across it.
I had been mistaken for a student.
(Context: the in-laws live in a university town, and in fact work for the university in the town. Side note: how is it so many people in my family work in higher ed?)
So, here I am in a strange town, dressed the way I always am in the summer (shorts, t-shirt, flip flops), and me and my growing bald spot and full beard get mistaken for a student.
Gotta tell ya, it was nice.
I think it must have been the flip flops.