As a caddy, I would appreciate it if you didn't do that.
Have you ever hit a caddy with your club out of anger?
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To tell you the truth, I've never even SEEN a caddy. I seem to live in the land of electric carts, but I've never hit one of them with a club on purpose either.
Seriously, I would think that would be grounds for a pretty serious assault and battery charge, and I would think immediate expulsion from the club for the culprit.
Chuckle. I didn't think the OP was serious about the question and this answer was very appropriate for that.
The only chance I will hire a caddy is at Pebble Beach (if I ever decide to play there) and I will make sure I will start him with a good punch to his gut to set the tone. Hey, if I am paying that much money for a round .....
I am reminded of a story I read in a Lewis Grizzard book. According to the story, Lewis was playing in Scotland, at St. Andrews I think, and having a bad day. He said to his caddy, "You must be the worst caddy in all of Scotland." The caddy replied, "Sir, that would be too great a coincidence!"
One time playing with a caddie I hit 7 iron from 160 yards and stuck it to about 5 feet. A couple holes later I was sitting at about 162 yards and the caddie recommended I hit a 7 iron again. This time it only went about 90 yards straight right into a pond. I proceeded to brutally beat my caddie with said 7 iron for improper yardage. Unbelievable that the guy could be 70 yards off on my yardage!