Carrier trick, thanks to Rufus who is PANICKED about carriers, possibly due to being trapped twice and definitely related to being in a carrier and falling off a table once.

Grab a towel. Wrap cat completely in towel, over head as well, so that he can't see what's happening. Place towel wrapped cat in carrier. Do not remove towel. He'll be so pissy about the towel that he won't be as hysterical about the carrier.

Good luck!