When you set out to pick up a 486 DX2 industrial PC and you come home with...
5x 486 DX2 industrial PCs, each one complete with 14 slot ISA backplane, 486DX2 single board computer, serial cards, some other cards, hard drives, floppy drives, AT PSUs, and keys.
Three of them have never been used.
As well as a bunch of serial splitters and cables, about 7 boxes of brand new sealed floppy disks including some of those cool translucent ones, an internal ZIP250 drive with a few zip disks, and a PS3... Oh and a couple of Quadro GPUs... Probably some other things I've forgotten.
All for £50!
Love swooping in at the last minute when people are moving house and beginning to panic...

My VCR arrived as well, waiting for a couple of VHS' to arrive so I can make sure the mechanism survived shipping, but it is physically immaculate.
Also picked up a near mint boxed Thermaltake Soprano for £20, complete with a decent AM2/2+/3 motherboard, optical drive, and a cheapy PSU still in it.