No Bananas On The Boat Men’s T-Shirt. 100% pre-shrunk cotton t-shirt (except for heather colors, which contain 10% polyester). So what’s the deal with the superstition Bananas On The Boat? There are many stories. It is said to be a sure way not to catch fish, but also when early sailing ships would sink sometimes only the bananas they’d carried would be found floating on the surface. Also, spiders, snakes, and other poisonous vermin living among bananas carried on board would infest the ship and bite the occasional sailor. Or you could go with the fishing reason: The fastest sailing ships were used to get bananas to their destinations before they could spoil, so those attempting to troll fish from them never caught anything!