I actually haven’t had too many player/personnel encounters worth speaking of, personally. One time I made fun of Tim Lincecum when he was walking up behind me, I wouldn’t really count that among my favorite interactions, per say.
So I’ll recount a positive interaction my parents had, instead. My dad, through his company’s involvement with a DVT (deep vein thrombosis) drug, had been invited to a suite at a New York Mets game also shared by Hall of Famer and DVT spokesperson Tony Gwynn, who was throwing out the first pitch that night.