You're stuck in traffic again. Another driver is trying to edge into the carriageway. No one's letting him in and now he's looking mad at you. You don't know this driver and you're never likely to see him again- and you're running late. Do you let him in, or don't you?
Never miss a Nat Geo moment
Join our curious community and you'll have access to some great features!
Personalised content reflecting your interests on the site
Watch exclusive videos before anyone else
Favourite content that you like or want to check out later
Free SMS and Email reminders so you never miss a show
Get notified when content that interests you is published
Share your photos on Snap! that could appear on TV
Share your thoughts and opinions on various matters
Receive a monthly newsletter with loads of great content