To break a door down....use your foot(not you shoulderor body) and kick at the point where the lock is mounted.
To find water on a deserted island...look for bird droppings.
To fool a lie detector test...breath faster than normal on the pretest and bite your tongue. Do not anticipate questions, sit completely still except for one subtle, regular movement. Maintain eye contact and display confidence while thinking relaxing thoughts.
To survive quicksand, put a pole under your hips and then slowly pull out one leg at a time.