And what if (continuing the my previous thought) it is really cold outside and the liquid is really hot?
That might pose some unrecognized dangers. I imagine that the bloodvessels are probably constricted and the sudden heat will force them to expand...
Imagine, a person comes in from the cold, takes a sip from a cup of steaming hot tea and boom they explode before your eyes.
Scary. Life is full of known and unknown risks, dangers and threats.