The wrong time to use big words...

Actual conversation:

Oldest: ...and now I'm so pissed...
Me: What?!?! (In head: I did not hear what I thought I just heard...) EXCUSE ME. WHAT DID YOU JUST SAY?!?
Oldest: Me? I just said that I'm so pissed...
Me: WHAT?!?!?!? Say that one more time...
Oldest: Say what? I'm PISSED. P-I-S-S-E-D. Pissed...
Me: (turning speaker phone on for the cell) Listen to this. Say that again.
Oldest: Say WHAT? I am PISSED.
Wife: You can't kill the kid through the phone...
Me: You may think you're pissed now child, but I'm going to show you the true meaning of that word when I get home...

Upon arriving home, the child, with sibling in tow, tries to convince us that the word said was not P-I-S-S-E-D, but rather was Pifft. Hmmm, somehow they don't even seem spelled the same...Let the beatings begin...