JK Rowling helped a fan in need design her dream Harry Potter tattoo
Expecto patronum...

JK Rowling is like a real-life Father Christmas, spreading joy with a wave of her pen.
Twitter user @AlwaysJLover posted a message to Rowling identifying herself as a survivor of sexual assault, suicide, and self-harm, and asked whether Rowling would write Expecto Patronum for a very special tattoo she was planning.
https://twitter.com/AlwaysJLover/status/730427149983858688
@jk_rowling i wanna get 'expecto patronum' tattooed & it'd mean the world if it was in ur handwriting. here's why:') pic.twitter.com/fhldRiju3w
— ㅤkate • 30daysclean (@AlwaysJLover) May 11, 2016
Rowling obliged and hand-wrote the Expecto Patronum charm, saying " I love that you're working to heal and protect yourself. You deserve this. I hope it helps."
https://twitter.com/jk_rowling/status/730429168509460481
Little acts of kindness go a long way.
https://twitter.com/AlwaysJLover/status/730672680718979072