If you look closely while your watching Lord of the Rings, you can see that Legolas does make the most ridiculous and funny faces. He did that on purpose just to see if anyone would ever notice. JUST ANOTHER REASON TO LOVE HIM
When I hear LoTR fans saying this around a bonfire here in the UK for Guy Fawkes Night I always smile and shout MUSTER THE ROHIRRIM! Everyone who gets it laughs and shouts in response too, those that don't look at the rest of us like we're drunk or mad.