You should tip Uber drivers.
James took an Uber into town for a pub crawl with his friends.
James wants to have enough money to drink a lot.
James tips the Uber driver generously and orders slightly cheaper drinks.
James doesn't tip the Uber driver and can afford one additional drink.
James gets drunk and easily gets an Uber to take him home.
James spends the night sleeping in a dumpster because the last drink pushed him into passing out.