The Mona Lisa smile might have a contender - the Tadhg Furlong smirk.
The tighthead prop's form for Leinster was one of the topics for discussion on Wednesday Night Rugby, where Keith and Matty Williams were full of praise for the man with a perennial smile.
"I like Tadhg, he's a cracking fella [...] and has a little smirk on his face all the time," said Keith.
"He is pretty much living the dream. He is loving every single bit of it. I think you can see it - he's a bloody bear! I was a front-row forward, and I feel like Peter Stringer when I stand beside him. He's huge!
"He's scrummaging incredibly well. He has an air and an aura about him that is pretty much world-class.
"He is young and there's an awful lot more to come from him. There is something exciting about that - this is a guy that hasn't got near his peak yet."
Keith's admiration was matched, if not bettered, by Matt:
"Tadhg Furlong - wow! What can you say?
"Every other prop will tell you that they can do that - they can't, but this guy can."
Both believe that the contribution of Furlong to the Leinster setup stands them in good stead for this season's Heineken Champions Cup.
"The mindset of Leinster is either what will win them another competition because they are good enough, or hold them back and they will fail," according to Matt.
"Right now, in the early part of the year, is just where it needs to be."
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