One day one of the old macs was showing the frowny face in a in-session classroom. Boss sent me down there with specific instructions: "pull out the hard drive and beat it really hard with the handle of this screwdriver". I was like: "?" and he was like, "just do it".
So I go down there and let myself in, trying not to interrupt the class. I climb behind the computer on a cart and pull out the HD. I beat it with the handle, like a good 10 times. Of course this got the class all riled up. I blushed, but told them this was normal operating procedure. Plug it back in and it works. I was (secretly) as amazed as everyone else in the class.
Back in the IT office, I say it worked. IT boss smiles and nods. I ask how. Well as it turns out some of those old hard drives used a vegetable oil based lube that seizes up if it's not used for a while. So if you bash it it un-seizes and starts turning again.
Anyway great times, fun memories. We all got our CompTIA A+ certifications at the end, but don't ask me what IRQ number is for the parallel port these days.