I hope its nothing...I just found it a little unnerving when he did it for the first time. He did it in the middle of the night last night and woke me up...and now my other cat comes running to him whenever he does it. I don't know...I guess I'll just wait a few days to see if he keeps doing it. He is known to act a little strange sometimes...its like he freaks out and starts chasing nothing. LOL ....OMG...he just did his weird meow again