Oh, where to start... I guess I'll break them down by workplace, lol.
Coffee Shop -
We had one customer that would come through drive thru with their pet bird, one day the bird decided to fly off their shoulder and into the store... that was fun.
We would be constantly having customers try to bring their pets into the store, even though they aren't allowed by the health board. One day I was collecting someone's change from their hand when I felt whiskers on my fingers. They had their pet rat in the sleeve of their sweater...
I was working the sandwich station one day when a customer walked by and randomly threw a cup of water in my face.
Drug Store -
One day someone stole something, one of the managers confronted him when he was trying to leave. The guy ended up trying to stab the manager with a knife. Now we're not allowed to say anything to them, we're just supposed to follow them around the store if we suspect something and if we actually see them take something we're supposed to call the police and try to keep them in the store.
We also have a regular customer/shop lifter that comes in, he's been banned from the store but he still comes. Anyways, one day I was following him around and he starts yelling at me about how he has 16 PHDs and he's a doctor, etc, and then starts going on about how the manager only has us follow him around when he's in the store because she wants to be with him.



?! This guy definitely does not have that many PHDs, if he even has one, he's just crazy. He also will take things off the shelf (like sugar) and poke holes in them, then put them in his cart so that he's leaking the product all over the store. We've even volunteered to have the thing he wants delivered for free, but he won't have it.
Customers also feel that it's alright to bring their pets into the store, again, health regulations say they can't because we sell food. One day a lady brought in a massive snake that was wrapped around her. We've also had birds, guinea pigs, rabbits and rats, as well as dogs. One of our employees used to bring her dog in when she'd come in shopping, off all people she should know.
The customers that don't bring their pets in tend to tie them up on the railings just outside the front of the store, which is fine, but one day a dog slipped his collar and came running in the store looking for it's owner, lol. We've also had dogs jump out of open car windows and come up the store, waiting for their owners to come out.
I work in the photo lab, mostly. We used to have one customer that would come in and get photos done.... not that weird, but... her pictures would go like this; family pic, family pic, BDSM sex photo, family pic, family pic, family pic, BDSM photo, etc. I didn't really care because it's not illegal, but one of then younger girls that worked in there (20 at the time) actually talked to our lab manager about it and he had to speak to them, lol. They haven't been back since. So just a note to those of you thinking of developing these types of pictures - we look at all the photos (digital and film), we have to because of child porn laws.
One evening we had a lady come in wearing a bag on her head. She went down an aisle where a male manager was working and flashed him, then went about her business. She ended up stealing about $500 worth of fragrances, even though her appearance was so obvious.
That's all that I can think of right now, I'm sure I'll remember more later.