The real reason behind Red Hot Chil Peppers' Chad Smith and Will Ferrell's Internet sniping? Charity. The whole joking between the two -- who, let's face it, look enough alike to be brothers -- started when Ferrell noted the similarity between him and Smith during a Reddit AMA session and then posted a video on Funny Or Die's Instagram account saying, "It was great to finally clear up the fact that I am Chad Smith." Smith responded with his own video on Funny Or Die, telling Ferrell, "Stop impersonating me," and challenging him to a drum battle. Ferrell responded over the weekend, writing on Smith's Reddit AMA, "I saw your video and I graciously accept your invitation to a drum battle. If we can raise $300,000 for Cancer for College I will face off with you in the greatest drum vs. cowbell showdown the world has ever seen." Smith responded by saying, "Tell Will Ferrell anytime, anyplace, I'll take him down. I don't want to embarrass him, but I'd say don't bring your family. Especially children. I don't want them to see this." No date or venue has been announced yet for the charity drum battle.