Wouldn't it be awesome if the Screamer mine actually screamed as it flies towards you? Image the freakout.
Like this guy from Serious Sam:
Or the Ripper mine shaped like a chainsaw. Would make the ships look like they're crapping up chainsaws. Or maybe Chainsaw missile?!
Reminds me of a note you find in Doom 3, on one of the PDA-s, saying how they got a load of chainsaws on one of the ships, and a remark - "can you imagine a more useless tool in here?"
Turns out, they weren't useless.
Also, List of weapons that shoot other weapons that don't exist, but should