I threw out an old Sony data projector. The kind you would find in a 1990 era university lecturer room. 1meter long and heavy.
It still kind of went, but the lamp hour counter had already been reset on the same lamp and was at 1500 hours on a 1000hour lamp. So likely to explode any minute

And new lamps cost US$2000.
It was also 800x600 so not all that useful any more.
I couldn't bring myself to throw it out whole, so i took it completely to bits and found lots of useful parts including precision geared motors, fans, mechanical linkages etc..
The most interesting thing was the optics. Have you ever seen beam splitter cubes this big?
(AA eneloop battery for size)
