Guy 1: Let's say,
hypothetically, I was holding a shovel.
Guy 2: Let's say you weren't holding a shovel.
Guy 1: But let's say I was.
Guy 2: But what if you weren't?
Guy 1: But let's just
imagine that, hypothetically, I was.
Guy 2: But let's just imagine that, hypothetically, you weren't?
Guy 1: Stop goin' all
hypothetical warfare on me, douchebag!
Etc.