You just know that guy sneaky sniffs his own fingers a lot. There is just something about the way he stands; like he’s always a bit tensed for the opportunity to sneak a quick sniff.
Is there something wrong with sniffing your fingers? I unconsciously sniff my fingers all the time. It’s a behavior I picked up from my dad, who picked it up from his dad. It’s part of the way I interact with the world, I guess. Helps me know how things I’ve touched smell.