Ok, F it; I can't wait until tomorrow for your reply.
First of all, the McDonald's coffee lawsuit is off topic and irrelevant. But since it's important to you, let me offer my opinion as it relates to your interpretation of how it is relevant to this thread.
If you are stupid enough to stand out in a thunder storm, getting wet from the rain, near a large metal object, then you have nobody to blame when your dumb ass gets zapped to the floor by lightning.
Very similar to (as you think it's relevant) getting your junk burned by a hot substance that you elected to place (while hot) in the general region of your junk.
Was the cashier responsible for you burning your crotch or was it your own dumb ass fault for placing the HOT liquid in an area that it COULD actually burn your dick while you were responsible for safely operating your motor vehicle?
DUH, would be the appropriate response.