Bought a mug that is an exact replica of the one the angel Aziraphale from Good Omens uses.
The day it arrived I washed it, had one cup of cocoa in it and knocked it off the coffee table. It completely shattered.
Luckily it wasn't expensive so I bought a new one on amazon and had it delivered the next day but I was very cross with myself.
Bought a pair of black jeans while shopping one day. Was going out that night (nowhere fancy just local for a couple of drinks).
Noticed the toilet /bathroom needed a bit of bleach throwing at it when I went for a wee before I left (ds had just learned to use the toilet and his aim was not great), so I gave it all a squirt. Wearing brand new black jeans.
Got to the pub, bought a round, sat down and then noticed a huge yellow splodge on my jeans, tried to brush it off thinking it was dust or something but no. It was bleach. They were approximately 8 hours old at that point and were truly ruined. They went in the bin that night.
Got some money for my 16th birthday, spent most of it in virgin records. Put all my lovely new music and films (about £50 worth in 2015) into one bag.
Went to buy some clothes with my remaining birthday money. Left the bag in the changing room. Went back and it was nowhere to be found. There were many many tears.