Many are calling it the strangest weather phenomenon they've ever seen (but Youtube reveals several people have seen it). This week a Scottish river was home to several dozen frozen pancakes. Watch below for more videos of similar ice pancakes from around the world.

I found several more videos called "ice pancakes forming" but they weren't perfectly round. It's not unusual for discus-shaped chunks of ice to form, but the perfect circles is something else entirely.

The most logical explanation I've seen is that they're swirling foam that freezes.