If you prank him, he will think the cause is this listing...
Maybe he should take this as an opportunity to do some pranking himself.
For example, if people call asking where court room 5 is, he can give them oddball explanations. Stuff like,
"That room is closed due group of people defecating on the floor."
"You lost the case and the court is adjourned."
"ibaibaibaibaibaibaibaiba"
Well you get the idea.
MIB