Staying calm is your best bet,
But anger causes to forget!
“...and Moshe became angry with Elazar and Itamar...And Aaron spoke to Moshe, "But today, did they offer up…” Moshe heard [this], and it pleased him” (Vayikra 10-20). [Moshe] admitted [that Aaron was correct,] and was not ashamed, [for he could have covered up by] saying, “I have not heard [of this law. Rather, Moses said to Aaron, “You are right! I did hear that an onain must not eat from sacrifices that will be offered in future generations, but I forgot!”]. -- Rashi to Vayikra 10:20 (additions in brackets are based on Zevachim 101b and Toras Kohanim 10:60)