I really like those "driverless cars." I saw loads of them last week in the car park.
Driverless Car Sighting
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. The joke here is that the person saw a bunch of "driverless cars" in the parking lot. But, newsflash, cars parked in a parking lot aren't being driven, genius! So, technically, they're all "driverless" at that moment. It's funny because it's so obvious, which is probably why you didn't get it.