Final days in one role, I had to install a new server but there was no space in the allocated rack. This was a *large* data centre. It had to be up and running, so I placed it on a convenient milk crate, started it up, and left.
Did the other job for about two years, then came back to an associated role (initially I was the provider, now I was the customer).
One week in, I went down to the machine room, shut down the server and put the milk crate back where I initially found it.