Nikola invites his friends for a coffee, but they decide to troll him by constantly slurping and making irritating and annoying sounds, which than makes Nikola go off the rails in the most unexpectable way possible.
The plot hinges on the central characters having a double: a middle class businessman is indistinguishable from the hall porter of a shady hotel, and the two are persistently mistaken for each other, to the bafflement of both.