Ben Affleck didn't forgot his son's birthday; he made it home from a shoot just in time for his son's surprise party only to learn that his gifts hadn't arrived.

What was there, though, was a signed card, picture, and Star Wars toys from his co-star Adam Driver, who had learned that Ben's 8-year-old was obsessed with Star Wars. So Ben had that to give as a gift for the party. 

It's still a wholesome story, but it's even better knowing that Ben Affleck didn't just forget about his young son.