Different verses of this song exist and you can choose which ones you like to sing. You can even make up your own rhymes.

Down by the Bay - American Children's Songs - The USA - Mama Lisa's World: Children's Songs and Rhymes from Around the World  - Intro Image

Notes

The kids' singer Raffi made "Down by the Bay" popular in the US, although it was known before that.

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Here are some more verses sent by Tony and Kendra Gioia:

Did you ever see rats wearing silk hats?
Did you ever see a goose drinking apple juice?
Did you ever see a goat riding in a boat?
Did you ever see a moose with a loose front tooth?
Did you ever see an octopus, dancing with a platypus?
Did you ever see a time, when you couldn't make a rhyme?
Did you ever see a fox, hiding in a box?
Did you ever see a fish do a hula in a dish?
Did you ever see a duck in a pickup truck?
Did you ever see a snake baking a cake?
Did you ever see a cat, wearing a hat?
Did you ever see an ant, climbing a plant?
Did you ever see a mouse, building a house?
Did you ever see a hog walking a dog?
Did you ever see a dog dancing with a frog?
Did you ever see a bat kissing a cat?
Did you ever see a toad running in the road?

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Thanks and Acknowledgements

Thanks to Tony and Kendra Gioia for sharing more verses!