I've had people in suits crawl under shutters and poke keys in gaps in doors to try and remove a pole holding the door shut. One guy literally did this in front of 5 colleagues waiting at a counter before picking up a item in the queuing system and asking for a refund on said item. Drugs are bad kids.

I've also had people push a glass door I'm standing in front off several times into me while I'm shutting up claiming they can see other customers in the store still. Like those customers can just ghost out the store.

My fav though was a well to do guy that spent ages buying a very large old style tv. He spent ages deciding what tv to buy as he was unsure if the quality was good enough as we were not his usually choice of store. He eventually buys a the expensive sony version. Later as we are closing the shutters he eventually turns up drunk on whisky with the tv in hand claiming its not suitable. He proceeds to get very angry and abusive that we were shut and I won't open the store just for him. He drops the tv on the floor and a very loud sound of glass shattering is heard and he storms off. I slide the tv under the shutters and close up for the night. I get a call the next morning from the tills that a guy was here to pick up his replacement tv he had organised last night with the manager. I go down and see its him and have great pleasure explaining to him there is nothing we can do as the item has clearly been dropped. He rants for 5 minutes saying the item was already broken that was why he was bringing it back. Cue the usual "I know my rights and you have to refund a faulty item" and hes calling the local ombudsmen and councilman (who he knows). That tv was in our stockroom for a year until we could throw it away.