Things I've seen people do while biking:
Text Adjust the music on their iPod Eat Drink Eat and Drink (each hand individually occupied) Offer a friend licorice while also eating that licorice Smoke Scream monkey noises into the phone while another friend on a different bike also screams monkey noises into their phone Bike while holding an umbrella Bike with their hands in their pockets Bike with one hand on another person's Vespa so you don't actually have to pedal Hop on the seat side-saddle and then swing your feet over after the bike is already moving Hold hands with someone on a different bike