You shouldn't lie in front of your friends.
Fred is with his friends at a party and the group are talking about cars.
Fred wants to his friends to think he is handy.
Fred tells his friends that he is planning to do a few DIY maintenance tasks on his car soon.
Fred tells his friends that he re-did the brakes on his car last week when he actually knows nothing about car brake systems.
One of Fred's friends asks to do one of these tasks together and two look up information online and spend all weekend working on their cars together.
One of Fred's friends asks him to help re-do his brakes soon and Fred has to make up an excuse on the fly.