My funniest one
A very long time ago, in the days when software come on multiple floppies...
I get a call - "The computer is eating disks - I put in disk one, and it asked for disk 2, which I put in, but it is still asking for disk 2".
So I go through all kinds of stuff, to no avail, and eventually I have to go on site.
I get there and the 3.5" floppy drive has a small gap in the case below it - I open up the case and inside is a stack of like 10 disks.
I guess the user was right after all.