I've been doing some anecdotal research into what indicates sarcasm in spoken form. My goal is to find indicators of sarcasm without relying on the meaning of the words and sentences themselves.
Intonation is the most obvious indicator of sarcasm that I can think of. The sentence has the intonation of a declarative sentence, but it's structured as an interrogative one, or vice versa:
"Did you want my dog to eat your breakfast?"
"How happy am I that breakfast is ruined."
I've also noticed a pause mid sentence, and some elongation of vowels, too - but I'm not sure how to quantify this observation.
Are there commonly known indicators of sarcasm that are expressed orally in English which are not lexical?