I've seen this multiple times. I've put out water in a plastic bowl on a hot day and they'll overturn it and possibly try to fly away with it. One even tried to take the metal dish I use to put out water and cat food on my porch.
It's so strange! They often flip it or move it but this is the first time they took it. I wonder if he just likes it or whether he actually has something he wants to do with it.