Is this little shock from an outlet something to worry about?

I was trying to plug in an iphone charger. I was wiggling the plug around in front of the outlet. My fingers were touching both teh plug and the outlet, and I got a little shock that didn't really hurt, mostly just surprised me. The shock traveled about halfway up my elbow (probably 4 inches above my wrist.) Is this something to worry about?
I think I'm completely fine, but I'm just making sure. It was my left hand. I mean, if I can type, I'm good, right?

You're fine.

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