I had so many embarrassing moments when I worked at a hotel last year. To list a few:
. A group of ladies left a naked, life-sized blow-up man in their room so I had to walk across the hotel floor with this man in my arms in order to leave it in our department office landing area where it would later be taken out with rubbish.
. I knocked on a room door and stated my purposes a few times, as we do, and heard no response. So I went into the room and didn't realise until I'd walked all the way up to the double bed that two people were still snoring away in the bed.
. Knocked and stated, received no reply (as above). Opened the door with my card key, and immediately see a credit card left on the side table. I quietly tut to myself and look at it, about to take it away to place in a plastic bag which would then be taken into the department office for safekeeping. Then someone suddenly grunts and sits up in the bed of the room, startling me. Realising I looked like a thief, I apologised and said I'd return later, to which he just mumbled something like "yeah" or "OK". I think he was drunk or half-asleep.
Also had many embarrassing moments when I worked for a furniture supply and installation company, but those are anxiety-related and so less funny and more unpleasant to remember.
I also nearly broke a computer monitor of Argos's by mistake while trying to swivel it around so that the customer could see while I searched for relevant products in their interest. It was the customer I had to thank for saving my life when she luckily caught the monitor just before it fell.
I did break a candle in storage when trying to collect a box of them from the very top storage shelf while on a ladder. The box that the candles were in, stupidly, wasn't a simple square box, and I couldn't see that it had a shorter side at the back which the candle unfortunately slipped through in the process.
Trying to help a customer haul a Christmas tree across the store and then basically leaving them to struggle on their own because I couldn't leave the store to help them any further was awkward. I can't remember if I suggested Argos delivery for them but I hope I did. Maybe they refused.
It's really awkward, frightening or embarrassing at the time, but after some time it can serve as a funny event to look back on and laugh about. My brother told me that he accidentally called someone who was obviously a woman "Sir" when he was on meet-and-greet for a DIY and garden products store.