I'd start with a complete set of SAE and metric deep socket impact sockets, but then I'm the type wanting to always be prepared to fix common issues with people's vehicles.
There's a fine line between being a tool/parts hoarder, and simply being helpful/prepared. Not sure what side of that line I'm on, but I did have one of those micro fuses some cars have these days when the neighbor's boyfriend blew his stereo circuit. If you buy them in advance, you can get a whole box of assorted ones for nearly the price you'd pay for a single fuse at the parts store.
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