Off the top of my head, just from TPM, charging toward Qui-Gon and Maul through the shielded corridor, repeatedly spinning his saber to the side; mimicking Maul's efficient disengagement by doing his own balletic pose just after Qui-Gon was stabbed; earlier he and Qui-Gon followed Maul jumping over a bridge, Qui-Gon simply jumps, Kenobi flips. I've noticed the pointless spinning many times throughout the PT. In ROTS, his stance when he says, "I don't think so," as he faces Grievous is just silly. I'm going a lot from memory and what I've read of others more knowledgeable in sword-fighting, but now that they pointed it out, instead of looking cool, it bugs me a bit. It looks "cool" in the sense that it's fast and carries a sort of arrogance with it that we Americans are so fond of, but in reality it's just wasted energy.