When I was 9 years old, I obtained Harmon Killebrew's autograph in person during spring training. Harmon was a 20 year old bonus baby at the time.
I bet he wondered why a nine year old punk wanted his autograph.
The nine year old punk had similar thoughts about if this 20 year old was a legit major leaguer.
His autograph was quite nice though and worth keeping. Still have it