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A spare can be the difference between arriving somewhere 30 minutes late and waiting two hours to be taken home.

This is the overlooked part, a spare lets you actually continue the journey

Sure, as long as you have a charged, working cell phone and can afford to pay for roadside assistance. If your phone died or your bank account is in the red, you're screwed.

Actual worst case, you're stuck on the side of the road god-knows-where, for god-knows-how-long, hoping that someone will drive by and have the decency to stop and help.

I think I'll buy a car with a spare tire.

I love having a spare tire, but some people are STUPID about them. Especially those dumb donuts. They will drive on them at excessive speeds and for obscene amounts of time. They are kind of a public hazard. Full size spares are cool though.