I've noticed it more and more lately... there are a number of hip-hop artists who have one finger on their upper lip while spitting rhymes.

Now, I get that you want to keep a consistent position of the mic while you're talking into it, but doesn't that finger get a little freakin' annoying? Are you trying to remember what kind of sandwich you ate earlier in the day? Maybe there's some other reason you're smelling your finger... I don't know.

I've noticed that Jay-Z seems to be the one to constantly and consistently do this:

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Just thought that it was a bit odd... so, what's the reason?