Emergency Deo Spray for Public Transport
It's the disgusting side of summer: You get into a tram on a hot day, and the air is filled with the smell of old sweat. Wisely, the constructors of trams have mounted the bars to hold on to well above your head (I think it's like that in every country) to ensure that there will always be a fresh supply of stale smells. This way, everybody can point their spelly armpits directly at your face (and nose).
I propose that there should be a mandatory deo spray in every car. This way, everybody can exert his right of self defense and do his neighbor a favor at the same time.
The emergeny deo spray could be mounted right between the emergeny brake and the fire extinguisher.