As a retired Navy aircrewman and maintenance man, one maintenance sign-off I did still sticks in my mind:

The aircraft commander wrote: "UHF2 totally inoperative during entire flight."

My sign-off: "Placed UHF2 "ON-OFF" switch in "ON" position. UHF2 works 4.0."

Needness to say, the old maintenance chief did have a talk with me after he read it...but he left it in the book.

And then there was the time a C-9 crew asked me (I was the maintenance chief at the time) to play a joke on one of their new female pilots. When she came in to read the maintenance book and sign-out the aircraft, I placed a bottle of scotch on the counter and said, "If you're going to fly THAT aircraft, you're going to NEED this!"