Ironic
The uncomfortable silence in the Impala was suddenly broken by Sam beginning to chuckle like a madman for no apparent reason.
"Sammy?" Dean asked tersely.
"Come on, talk to me, man."
"Nothing, Dean, don't worry."
If silence could be sceptic or doubtful, this one sure was.
"It's just… We are going to drain the alpha vampire."
"And?"
"It's exactly what the bloodsuckers usually do with their victims. Drain 'em dry."
"And?"
"Don't you think it's a bit ironic?"
"No."
"Okay, okay, it was just a thought…"
"Well, stop thinking then!"
The rest of the drive was spent in familiar silence.