This was me shortly after losing it because my daughter had tagged my mother's walls!!!!!!!
We were sitting at the dinner table when M showed me her red finger. Luckily, she openly admitted to drawing on her bed and showed it to me right away.
I was not very good at remaining calm, however. I sometimes wish that our kids could go away when they're toddlers and come back potty trained and post-tantrum phase. Then my mom reminds me that they'd come back as adults and I feel bad. :)