for example: don't pick up EVERY person on the side of the road, cause you might end up in your tidy whities on the railroad tracks when you wake up (I love how the character remarks, "not again")
If you plan on using sticky bombs to blow the doors off a armored car, make sure you're standing far enough away that you don't get blown up.
Also, fighter jets run out of fuel. A bad place to learn this is a mile out from your hanger when the engine suddenly shuts off. Skyscrapers are bad news for stalled jets.