Trotín Troteras is the disinterested witness of the absurd situations lived first by a lecturer and then by a soldier with an umbrella, which opens when it stops raining and closes when it rains…

A drug has been discovered, Liberxina 90, which will erase "establishment" conditioning from the human mind. It has fallen into the hands of some diversely anarchistic revolutionaries who spend most of the film discussing how and whether to use it; should they wait for the forces of "history" to undermine society or speed things up using the drug? They are finally forced into action by the police who are, somewhat ineptly, hunting them down.

Throughout three different episodes, an emigrant mistrusts the girlfriend he left in Spain, a boyfriend has relations with a tourist and a workshop mechanic drives a client's car on his day off.