I didn't mention the Atari 520 (or is it a 1040?) STE in the loft somewhere with 4 Mb memory which was scrapped from Sun workstations, an externat HDD (8") in a box the size of a stack stereo component (I think the drive was ESDI) plus colour and mono screens, games and office utilities (I learned spreadsheets on a Lotus 123-alike. Backwards compatability means the commands still work today), plus a Lego compatible robotics kit and a load of Lego (which may well be worth more than the computer). Oh, and somewhere there is a dot matrix printer to go with it.
I'm scared to fire it all up in case it doesn't work.
Oh, and on a non-computing front I had rickets as a kid (blame rationing) so my parents bought a sun ray lamp. Still in the loft. Works by creating a mercury arc light with real mercury. Puddles of it. Looking at the wiring I would be reluctant to fire (!) it up now but it is still a bit of awesome technology.