good morning. >> good morning. >> what is punkin chunkin?at it is? >> it's a competition of seeing who can throw it the farthest. >> we are talking people are spending almost a million dollars on machines like air cannons and catapults. they are getting distances of 4,000 feet. >> this is serious stuff. 25 years this has been going on. at comic-con you have a panel set up. what are people going to learn today? >> we are going to give them a taste of what they will be able to expect from the punkin chunkin event. we'll have chunkers there. >> is that what they are call? >> yeah. they are wild. they are backyard engineers and they are crazy. >> you guys, you know this stuff so well from myth busters, you think i could go out in my backyard and chunk a pumpkin. what is the secret to making the best catapult? >> there are secrets in engineering they are not going give up. you need a passion to spend your entire year waiting for this one day. you can't go in your backyard and build this little machine. >> how far? 50 yards? >> almost a mile. >> w