Once a whale is on a beach, it cannot get back into the easily, so if you are completely stuck somewhere and can't get away, you are stranded like a beached whale.
If someone needs something like a Fish Needs a Bicycle, they do not need it at all, originally a feminist slogan: A woman needs a man like a fish needs a bicycle.
If people leave a company because they know that it's about to have serious problems, or turn their back on a person about to be in a similar situation, they are said to be like rats deserting a sinking ship.
If I say my children are growing like no one's business, it means they're growing very quickly. See also 'Like the clappers' and 'Like there's no tomorrow'.
If something is going like the clappers, it is going very fast.
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