Some say he didn't know any better but i'm with you. Mad as a fish!
Some clarification required here. Not all fish are mad.
The Scottish ones who jump up waterfalls are clearly away with the fairies. We need not doubt that for a moment.
But what about the big, scary ones (whales?) in the scary films with fins that stick out of the water?
They're not mad, just hungry. Very hungry.
Also, cod are probably not mad either. They are famous for taking a balanced view on strategic decisions and being generally prudent.
Please be more specific before you start accusing all fish (by implication) of being as mad as a pro-cyclist.