Unplugging preamp, amp and cable while music is playing

It's an in joke. If you don't get it, oh well.

Usually the worst that will happen is you hear a disturbingly loud awful thump or pop or other scary sound. But usually no harm but to your pride. The big exception being tube amps, where if you were to disconnect a speaker cable while playing and not notice and shut the thing down right away has the potential to literally smoke your amp. 

"say you accidentally stripped on the power cable"

In this case I would say good one, tubebuffer.