Quote from : Percy Jackson's Greek Gods Book

Headache!" Zeus bellowed. "Bad. bad headache!" As if to prove his point, the lord of the universe slammed his face into his pancakes, which demolished the pancakes and the plate and put a crack in the table, but did nothing for his headache. "Aspirin?" Apollo suggested. (he was the god of healing) "Nice cup og tea?" Hestia suggested "I could split your skull open," offered Hephaestus, the blacksmith god "Hephaestus!" Hera cried. "Don't talk to your father that way!" "What?" Hephaestus demanded "Clearly he's got a problem in there. I could open up the hood and take a look. Might relieve the pressure. Besides, he's immortal. It won't kill him