Take the Jason "stoic" challenge

I contend that Jason makes a face every time he drinks something that he doesn't like. He adamantly denies this and tells me that he is always stoic and dignified.
I decided to collect some photographic evidence on Saturday in Karlovy Vary. So I took a few pictures of Jason while he was tasting the mineral water. I think they show Jason making a "this is disgusting" face, but he insists that he has a stoic expression.
So, help us decide. I included one picture here, but there are several other on the Picasa site -- including a pre picture for comparison.

Is Jason disgusted or dignified? Stoic or silly?