In the US there is an increasing number of people reporting black military style helicopters flying over neighborhoods, especially late at night. I was visiting a friend out of state and every night I heard strange sounds I couldn't place. One night I was outside late at night and witnessed the helicopters myself. This had been the strange sounds I was hearing every night. They did not live near an airport or military base for there to be regular flyover.
I am not a fan of conspiracy theories, but I do find the copters disconcerting.
The chem trails are an old conspiracy theory I've never bought into.