David Spade's personal assistant famously attacked him with a stun gun, so be careful!
Normally, though, the story is the reverse: a celeb mis-treated their personal assistant and is now being sued.
Or gets totally thrown under the bus by hostile testimony, like is happening to Amber Heard right now in the Heard/Depp trial. Her PA poked a bunch of holes in Heard's story after AH tried to publicly claim a personal tragedy of the PA's as her own for sympathy and lost all of the PA's goodwill.
Don't screw with the person who knows your whole life in and out, I guess.