I saw something weird on a red-eye recently that maybe someone can explain:

We were going over a pretty rural area. I saw what looked like the fan of headlights but in these large marbleized shapes like large lightning-crackles. They just sort of moved across the ground and then fizzled out. The movement patterns would be kind of like clouds dissipating but it definitely looked like lights? Very weird.

Something like ball lightning? https://en.wikipedia.org/wiki/Ball_lightning