I was watching a program "what would happen if" (or something along that line) in NatGeo and was stunned by what i saw in it. This is the situation. Several helium balloons are suspended from a car's roof panel through strings (interior of the car). When the car decelerates, what direction do you think the balloons would swing to? forward? NO. That doesn't seem to be the way nature prefer. The balloons swung back in unison when the car was braked. The anchor said something about the air in the car rushing front and as a result a low pressure region being created at the back.. Can someone clarify this further? P.S: I think this thread could also be used to share other non-intuitive events.