My brother-in-law knows Grohl -- has even been to his house for BBQ. He grew up in NC and is a big BBQ fan. Apparently he's a super nice, down to earth guy all around. It's no surprise he did this.
That's awesome! Not a massive fan of Foo Fighters, but I am a big Dave Grohl fan. Heard the same as others have posted - just a good, down-to-Earth, almost normal dude.
Also - My compliments to @luvflyin - THIS is how to post a video. Summary of what is in the vid posted up front and center. 10/10 would read thread again.