In a certain big supermarket this morning, I was getting a few last minute things, and I grabbed a sherry trifle. The last one! As I popped it into the trolley, a woman next to me sighed and huffed and puffed, and asked a shop assistant near me if they had any more. He said 'no, sorry.' The woman asked if any more were coming in tomorrow. He said 'I don't think we'll be having any more now til after Boxing day.' The woman scowled at me. I thought 'bloody hell it's not my fault I got the last one.'
I walked around the store and got some more things I needed, with the trifle placed at the bottom of the trolley where nothing could crush it, and the bloody woman seemed to be 10 feet behind me for the next 10 minutes I was in the store.
The last item I wanted was a loaf of bread. I reached up to check the dates, and popped the bread into the trolley. I started making my way back to the checkout, and noticed the trifle was gone! 
The woman in question was practically jogging to the self checkout! I followed quickly, and sure enough, she had my fecking sherry trifle! I said 'are you kidding me?! You've taken my bloody trifle!' She said 'no I didn't! I found this mixed in with the cheeses, it's mine.'
I knew she was lying, as there was no more left after I took mine, and now she has one and mine is gone! She definitely took my sherry trifle! I told a member of staff, but they said there's really nothing they can do, as technically no-one has stolen anything. I was so pissed off! Never going to get another one the day before Christmas, and I'm not chasing around the county to look for one. Also, this store is the only one I have seen selling sherry trifles!
On the way out, she smirked at me and said 'Merry Christmas!' I was like
AIBU to hope the sherry trifle gives her the shits?! 
I went back in and got a raspberry trifle by the way, but I'm so pissed off.
P.s. No, I'm not making my own. It's too late to source all the ingredients now anyway!