[SunTzuWu]

One of your neighbors has one of those Christmas laser projectors. The spillover was seen in the trees. They have become very popular and cheap.

[EBH]

Now that seems like a likely answer!

[Reno89519]

"One of your neighbors has one of those Christmas laser projectors. The spillover was seen in the trees. They have become very popular and cheap."

Yep, that, night, good company, hot tub, and drink...