July 3, 2015 11:48 AM EDT

For one Arnold Schwarzenegger fan, the new Terminator Genisys provided exactly the kind of movie magic he needed to get his sick father to smile again.

Reddit user bizzyjay posted about how he got his dad to watch a movie despite recent serious mental health issues that made the 72-year-old irritable, according to The Hollywood Reporter. The two had a tradition of watching Terminator movies together, and when they saw the latest installment, he said his father smiled for the first time in months.

Schwarzenegger, who is known for being active on Reddit, responded to the post himself, saying, “This is so touching. Thank you for sharing. I’d like to say ‘this is why I do this’ but you should know it was you who made your father smile.”

He then posted a handwritten note to the father, writing, “I am honored that my silly smile in Terminator made you smile, but I hope you find real joy and strength in what a wonderful child you have brought into this world and raised.”

He signed the note “Arnold” with a heart.

[The Hollywood Reporter]

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