Sir Eats-A-Lot is a fixed male about three years old. His "me" time is together with me while I'm on the "throne" in the bathroom. He usually flops down and rolls over for belly rubs. While he's there, he "air-kneads" but simultaneously flaps his tail aggressively on the floor. That's generally an aggressive sign, but the kneading is a calm sign. Anybody have an idea how to interpret his behavior?