I have had people ask me if they could paint bollards, clean bathrooms, fix signs etc etc. Most aren't hostile about it though, just kinda sad when you say no.
Most bizarre experience?
One location took down my license plate number because I apparently received permission from the lesser manager not the "head manager" at the time? For some reason this made the employee incredibly hostile because I was already taking pictures by the time he noticed.
When I saw he wrote down my license plate I LOST IT on him. I mean let holy hell rain from the sky LOST IT on him. I have never lost my temper before no matter what (worked as a store manager before this and am pretty unflappable)but I did not care in that moment if I was banned from the client. I told the employee how DARE HE be writing down the license plate of anyone, nevermind a female auditor driving by herself as she is grading his location. Like how do I know he doesn't have some buddy at the DMV or local PD that can turn that license plate into an address? Maybe that sounds absurb but you never know someone's level of crazy and writing down the plate number was already absurd.
Emailed the scheduler immediately and told her the entire thing. I was honest that I completely lost my temper and was actually YELLING but stressed how incredibly unsafe I felt, along with documenting it on the report. I didn't lose rights to the client so I assume the employee is the one who got in trouble.
Generally, though, a cranky or unfriendly employee is the most eventful thing that might happen.