KB261186: Computer Randomly Plays Classical Music
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Quite fitting though. Since the tune starts playing, left powered-on, the PC is going to turn into a hunk of junk soon. :) :)
The riddle goes: How many lights does a garbage truck have?
The answer: Nine of course! Dun-dun-dun-dun-dun-dun-dun-dun-dun.
It's funny only if you understand that the sound of the word for 'light' is the same as the sound you make when sounding out notes.
https://www.youtube.com/watch?v=9LeQogBE9oM https://en.wikipedia.org/wiki/It%27s_a_Small_World