What Does Karl's Face Mean?

Karl Pilkington pulls a face that has no meaning. Is it happiness, sadness, determination, constipation? What does Karl's face actually mean?
So, years later, I found that this channel still existed. I have been travelling the world & now I want to do funny videos - animations, documentaries, games, music - everything.

[@Xubelo]

... When he says, "The Waves", he then nods ... like he wanted to reassure himself - but his brain never sent the signal to nod right away.

[@andykaufmen]

i love you karl

[@RealOutOfSight]

he looks like he's just kicked his height and landed on his arse, but cushioned the fall with his pilko pump-pants

[@Crackerjacker982]

he was completelt knackered through the entire series wasnt he?
you can see it in his eyes, always on edge
but here he is finaly enjoying something but he is so tired that his expression is all messed up :P
thats my theory anyway

[@kanebhoy3]

like a kid in a sweet shop with no clue what the hell to do karls a legend!!!

[@superfantastiisch]

@Xubelo
So this is the evidence: Karl is indeed NOT in charge of his brain! ;-)