Q: Which bus crossed the ocean? ๐ŸŒŠ๐ŸšŒ A: The hippopota-"bus"! ๐Ÿฆ›๐ŸšŒ

Explanation: The joke plays on the word "bus" by incorporating a pun with the word "hippopotamus." By combining the words, we create a playful image of a hippopotamus driving a bus across the ocean, which is quite absurd and humorous. The use of the ๐ŸŒŠ emoji represents the ocean, while the ๐Ÿฆ› emoji represents the hippopotamus, adding a fun visual element to the joke.