I have a metaphor I like to use sometimes to describe the perils of over-extending metaphors. That's not exactly the same, but maybe it's relevant enough to share.
A metaphor is like an old rusty wheelbarrow; if you put too
much into it and push it too far, it will break down, you'll
trip over it, cut yourself, get infected with tetanus, and
end up in the hospital filled with regret.
I'm still not satisfied with the ending and tweak it slightly each time. It fits the pandemic humor rather well though.
