My older son tied his classmates shoes together in circle time when he was in Kindergarten, and my youngest is a constant source of new emails coming home to inform me of some new issue. The younger one seems to be a natural leader, and when he gets a goofy idea in his head, the rest of the kids follow suit. He's incited all the kids in his first grade class to get up from their desks and march around the room singing Canon in D, he convinced his recess buddies that climbing the slide while holding onto each other's backpacks was a good idea until one of the kids at the top of the ladder fell and pulled the rest down, and he actually has a waiting list for kids wanting a chance to "star" in the next "movie" that he shoots at home.
I think gifted kids tend to look at ideas that pop into their head and ask, "Why not? Wonder what would happen if..." - and then they go for it. It's just the challenge if directing that creative drive in a direction that won't lead them to a life of sitting in the hall or principal's office.

As to not knowing his math facts and complaining that they're hard - it could be an indicator of a learning disability, but it might just be the gifted mind not wanting to mess with rote learning. My older son hated to read, and he despised writing so much that he refused to create a short story for some writing festival his school was hosting in elementary school. And since 100% participation was required, the teacher passed a page around the room and had each kid add a sentence to the last. They put my son's name on it since he had one sentence in it that was actually his, and that was his entry. This is a kid who now reads college science and math text books on his iPod Touch for pleasure.