The little league basketball playoffs:

I was a benchwarmer but the coach wanted me to see some court time in front of my folks.
He said "go substitute for Alvin". Now I didn't know all the guys' names but I thought I knew who Alvin was - he was the guy getting ready for a free throw so I ran out to the line and tapped him on the shoulder ready to take his shot for him. The coach yelled "no not Arlyn - Alvin!!" The entire gymnasium broke out in laughter. Man did I feel dorky... also I had the dorkiest cutoff jean shorts while everybody else had cool basketball shorts.

All my hooker stories have happy endings.