Leo is as useful as a screen door on a submarine.
Leo's Usefulness
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is saying Leo is about as helpful as putting a screen door on a submarine. And, last time I checked, submarines are underwater. Screen doors are for keeping bugs out of your house. Putting a screen door on a submarine is like giving a fish a bicycle. Get it now, dummy?