Let me set a must-avoid scenario for you:
1. Start drinking at 7:30pm.
2. Continue drinking until 4am.
3. Decide that giving someone a piggyback ride is a good idea, especially while walking on decidedly resolute concrete.
4. Decide that readjustment mid-piggyback is not only necessary, but emphatic.
5. Emphatically readjust rider by thrusting rider upwards and forward.
6. Fall face first on the concrete, using hands and knees to brace impact for two people.
7. Do not roll to avoid spreading said impact.
8. Ignore broken bones and go to sleep.
There you have it. One instance in which life can be a bitch, BUT YOU CAN GET AROUND IT! Just don't follow the previous steps in the prescribed order and you won't end up right side down. Remember, life is fragile, and you are but a box of proverbial chocolates, melting in the sun.