|You are HERA. You've spotted your husband Zeus with Thetis. You know he was in love with her once, and would have had an affair, if he hadn't been warned off by a prophecy that any son of theirs would be mightier than his father. So Zeus arranged for her to marry a mortal, Peleus, and Achilles was weaker for having a mortal father.|
You suspect the pair of them were up to something - probably a deal involving your beloved Greeks getting slaughtered to help Achilles. You confront your husband. Zeus tells you to shut up, or he'll hit you.