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A couple of weeks ago my colleague and I ended up with splitting headaches because of the same issue - some guy walking around under our window in the hospital car park with a leaf blower for three hours. Thing is there weren't even any leaves there to begin with! He was just slowly wandering around pointing it at the concrete; really felt like someone trying to stretch out a pointless job so he could avoid doing something else he liked less.
(forum favourite) leaf blowers.
Working from work today and there is some pleb clearing the leaves from our car park, outside my office window, with a petrol noisy bastard blowing the leaves about.