Random question: I've been hearing this strange clarinet-like noise in my area - exactly like someone practising the clarinet except only one note, never a tune

Random question: I've been hearing this strange clarinet-like noise in my area - exactly like someone practising the clarinet except only one note, never a tune or scales. After puzzling this over for some time the only thing I can think that it might be, is someone going a balloon with nitrous. Is that plausible?