"You are a butthead, ha ha!"
"Oh really? I think you are a butthead."
"No, Tata Baji, you are the butthead."
"I'm pretty sure you are the butthead."
"NO, you are a butthead."
"Well, I looked at your passport and it said that your name was 'butthead'."
'"NO!!!" (pause to consider and formulate scathing response) "I . . . saw . . . my passport . . . and it said YOUR name was 'butthead'!"
For my fellow Scrabbie-lovers and Literati-haters, check this out.