if I can find one - a laugh noise maker like those in some greeting cards.
They make those that are having built in mike and being self recording of your voice message / sound effect that you put into it.
LIKE ! . . . . . .that unexpected squirt / S t r e e e e e e e e e e e m of wa-wa !
The closest that I came was a lone box with a single on -off switch with a BOLD lettered warning
label to be SURE to ALWAYS leave switch in OFF position for its battery conservation, ( which in that day and time frame would have been conventional zinc-carbon "D" cell sizes in a battery pack, then it was purposefully left in its ON position.
Then, a nosy, helpful persons corrective action would set off a LOUD warbling siren sound fed to a speaker, on bottom side, from an internal 5 W amplifier.
This was a prominent feature at the left front corner of my desk . . . .which, most times was being amiss of me . . .so an informed secretary (of the internal timed mercury switch) would have to quieten things down a bit.