Ben Affleck vintage car jeans drink lemonade

We still can't get over the news that Ben Affleck is going to be the new Batman, but that's not a bad thing -- we're ALL for seeing the sexy dad slip into yet another superhero suit!

Yesterday afternoon Ben stopped by a pal's house in his neighborhood, and he was sweet enough to buy a cup of lemonade from a young kid on the street. Whoops ... looks like it might have been a little on the sour side!

Ok, but back to Batman ... Ben's pal Matt Damon chatted with X17 about the casting decision, and he later defending his friend's upcoming role in an interview with The Times of India.

"You know, he's not playing King Lear," Damon said. "It's Batman, certainly within his skill set. If anybody saw Argo or The Town, and all the work he's been doing lately, it's way more nuanced and interesting and way more difficult than Batman!"

But don't expect Damon to play Batman's BFF Robin. "I am a little older than Ben. I never saw Robin as older than Batman," Matt added. "Somebody sent me a picture actually (of his face Photoshopped on Robin's body and Affleck's on Batman's). It was really funny. But it's safe to say I won't be Robin."