Especially when it is one of what @kimble once charmingly called, iirc, a 400Ω flying thing.Very unpleasant I agree, although I'm not sure if it's worse than catching one of the buggers full in the face when you're doing 30+ down the other side.
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Got one of those in the lip at some speed while descending once. Ouchie. Antihistamines ftw.
I also got a greenish leggy flying thing land on my back/shoulder while winching and inching my way up a (very lovely) hill on Arran once. Poor sod ended up involuntarily repatriated at least half a mile, to the top of the hill, because I couldn't brush it off without wobbling too much, the wind was non-existent due to slow speed so it didn't get blown away, and I wasn't going to stop and try to hill start and get going again to save it the hassle of navigating home.
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