Not everyone appreciates how smart fish can be. For instance flatfish - soles, plaice, flounders, and similar - are often highly intelligent. Astonishingly there are undersea crime gangs operated by these fishes.
Once, in a submarine investigation I had a sea cliff at my back, whilst in front was a flatfish I knew had been paid to kill me.
And as it happens I had just put my foot on some gluey seaweed. I thought: has my life come to this?
Stuck between a rock and a hired plaice.