A couple of years ago I spent a night in a fancy hotel in Varadero. Staying in the top floor, early in the morning I was waken up by an unmistakenly sound of a radial engine. Went to the balcony, and saw a yellow An-2 flying at the level of my room, spraying something, probably anti-mosquito stuff. Really a beautiful sight - and sound. Unfortunately I did not have a chance to grab my camera...