Thunder Star Alex Caruso Blocked A Shot With His Shoe Last Night

Yes. We needed to be reminded who said that.

There was that shoe thrown during the foggy Fl./LSU game a few years ago.

Is there actually a rule that applies? Some sort of foreign object?

well duh. if it wasn't players would have giant web-hand extensions that snapped into place when they were on defense

Resulted in a goaltending and technical for an "illegal defensive move". So yes.