in barcelona, there's a club where you pay per laugh. they set up these ipads on the back and show your face. every time you smile or laugh they charge you some money. that's what you end up paying. >> that's not a bad idea. they did this because they started taxing people on the tickets. sales went down. people didn't want to pay all the tickets. i love this idea. >> if it's funny, you pay more. you had a good time. i always laugh because sometimes i feel bad for the comics. and the poor comic is like, uh-uh. sorry. no freebies. >> you get charged for your fake charity laugh. a lot of people may be interested in this. that phone of yours it's always an issue to keep it charged. what if you could charge it by exercising. they've invented this at northwestern. a device that will charge your phone based an how much physical activity you are doing. so you go jogging, ride a bike. if you jog for 30 minutes, it can give you 50% to 75% charge on your battery. >> that's about three hours worth. >> but you have to get moving,