Olbrich Botanical Gardens - Madison, Wisconsin
This indoor garden area uses foggers to add humidity for the tropical and subtropical plants
and they have these somewhat large fish swimming around under the walkways and small bridges...
So of course people, being people, throw coins in the water, I s'pose trying to hit the fish :-)
Well I've never seen all three things in one place before, Fish, Fog and Coins, so figured I'd take a snap.

Canon EOS 10d
Sigma 70-300mm f/4-5.6 APO Macro Super II