mocking the muskrat and his blue checks
Elon gave Terry Pratchett a blue checkmark on Twitter, which says the account has "verified his phone number".
so imagine:
Elon's phone ringing No caller ID. Annoyed, he silences it. It keeps ringing. He turns the phone off. *It keeps ringing*. He picks up. On the other end of the line
"HELLO. I HAVE A COLLECT CALL FOR YOU FROM A MR. PRATCHETT. HE IS VERY INSISTENT YOU TAKE IT."