Puzzling event on the ride home today... I was riding SE down the Monash in the RH lane, going 100kph. There was a guy in a cage next to me (on left) and slightly behind. I was going to move over into one of the left lanes in order to exit at Eastlink, but I wasn't in a hurry b/c I had plenty of time. I wasn't holding anyone up behind me. Anyway, this guy keeps up with me, which is OK; he wasn't in my way. I was either going to go in front or behind, depending on how things went. The traffic in my lane slows down, so I pull up a bit and go behind him (not too close). This guy proceeds to give me what I gather to be a sarcastic round of applause. I have no idea why. I wasn't in his way; he wasn't looking to change lanes; he had no one in front of him. Weird.