I work at a coworking space and one of the companies there uses those spraycan horn things when they get a sale.

In a coworking space with everyone there trying to work? Wow.

It must be _really funny_ for people in the other companies when they're on the phone, maybe in a very important call, and the other person can hear a loud *HOOOOOOOOOOOOOOOONK* in the background.

What a bunch of douchebags.

Superglue the air horns to the desk(s), each one on top of a hotel "Do not disturb" sign.

Replace the air horns with @JustThat's fart spray cans. Swap their labels, and the horn too.

Tape a "SHH! You're in a library." sign to the inside of their door. Two-sided and on the outside facing in, if it's glass.

Hide a bluetooth speaker in their office. Play "BE QUIET!" clips after each ear-piercing toot. Or install a mic and record their toots: play back via hidden speaker at random intervals.

Hide a cellphone jammer in their office; remotely activate it after their first toot. Gather the other people in the office (organize before, naturally) to stand outside their office and scowl/glare, either through the glass or when they come out after discovering their phones no longer work. Chant "N O. E S C A P E." and slowly stomp forwards toward them. Continue as they run away.

@Root i wish i could do all that without getting fired

Just tell them to stop being dickbags, and that you're trying to work