What’s the most unnecessary but awesome engine swap you’ve seen or dreamed of doing?"

The wildest engine swaps that make no sense but are so cool

I was at a local meet last weekend and saw a Miata with a small-block Chevy crammed into it. It got me wondering what are some of the most ridiculous, totally impractical swaps you’ve come across? I’m talking about the ones that defy logic but put a huge grin on your face just thinking about them. I’ve always had this silly dream of dropping a high-revving motorcycle engine, maybe from a Hayabusa, into a tiny classic Mini. The weight distribution would be a nightmare and the wiring a headache, but imagine the sound and the revs! What’s your favorite “why would you do that?” swap that’s actually brilliant?