Years ago before coming out as trans, I went to a Speech camp in the summer. No, I don't have difficulties speaking, it was a camp for competetive public speaking (AKA- forensics). The camp was three hours away and the application to join the camp was done all online. In part of the application you check whether you are male or female for the purposes of knowing who has what roomates. The default gender was male, and if you were female you were to click the other bubble. There was an error on the page and it refreshed,going back to the male bubble without my noticing it.
When I got to the camp some weeks later, I gave them my name so they could give me my room key. When I gave them my name, they gave my this big-eyed look and called other councilers over.
"See, this is Shawn. As you can see, Shawn is a lovely lady. And Shawn has mistakenly been bunked with the boys."
I was so darn excited to bunk with the guys, but they changed it around. T_T
Yeah, my name is more masculine than feminine, so I have about a million stories involving "mistaken identity" and "OH! so you're a GIRL!".