From a joke thread here a few years back:

Two parrots are sitting on a perch and one says "can you smell fish"?


And:

Two fish are in a tank and one says "You man the guns and I'll drive".


Helen

(The reason I like jokes like this is that people stop, look really bewildered, don't get the joke, and then most doafter a while, or I have to repeat "Two parrots are sitting on a PERCH..."

I have a couple of similar ones but they aren't fish-related.