Recently While I was giving the Daf Yomi I came across this..
TB Z'vachim 31a on the Bottom
Rav Ashi asks:
What's the Halachah [re: piggul] when he planned to have one k'zayit eaten by TWO people?
Do we follow his machshavah and he has a k'zayit [the thought is one the cheftza]
Do we follow the consumers who have only half a k"zayit each [Gavra]
[See Below for original]
The conclusion is not as important as realizing that a major component of Brisker Methodology is merely an echo of the Talmud's own methodology
בעי רב אשי חישב לאכול כזית בשני בני אדם מהו בתר מחשבה אזלינן דאיכא שיעורא או בתר אוכלין אזלינן וליכא שיעורא