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Support Slack, upon login: OMG OMG OMG! Can't reach [site]! Danger, danger!
Me, to my team: It's DNS.
Team: Maybe not.
Me, 15 minutes later when the DNS entry is restored by whomever nuked it:
I was snickering behind my screen when the nerd herd arrived and was trying so hard not to say, "IT'S DNS!". Because cliche.
But it's funny because it's true.
Seriously, people - it's been 40+ years now. Just start with DNS.