Assume you and a friend are both thirsty, and you find a large bottle of water. Your friend takes a few gulps, then hands you the bottle. You take a sip and scald your tongue, because the water is nearly boiling. Then you realize your friend didn't exactly look relieved when she handed you the bottle. Would you sympathize with your pal (possibly making jokes) because you both are sharing the same pain? Or would you be pissed that she didn't warn you?