one is called "this is mark rober." >> mark: it is like my porch pirate glitter bomb on youtube to prank people who violate social norms. >> jimmy: around here, we violate norms regularly. we actually kill some norms. i think we have killed four norms here in hollywood this year. so we sent you out on the street to see what you were -- >> mark: people crossing the street, they are hazardous on their phones, and that is dangerous. it is sort of a psa. i took a normal bike and used my nasa engineering skills to level up the bike. >> jimmy: you made your bike bell into a very, very loud train horn. here is mark rober. >> mark: billions and billions of people are injured crossing the street each year because they are distracted on their phones. we are going to do something about it because i have got a bike and i have got a train horn. let's go save some lives. [horn honking] no phones in the intersection. it is kind of a safety thing with the city. it was. yeah. >> [bleep] >> mark: people are just so happy to learn about sa