Mushroom cloud. Weird, because I didn't even notice the thing going on in the sky in the distance until I looked at the scanned slide.
By the way, that's a puddle that regularly forms in a field I find myself in quite often, not a lake.
Tech trivia: Canon T50 and Canon FD 28mm f/2.8 shooting Fuji Velvia 50.
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(from the gallery Landscapes)