Rob Pattinson accepted Zac Efron's ALS Ice Bucket Challenge -- and then some!

On Wednesday Zac posted the video above on YouTube and tweeted, "#RobPattinsons not on social media, so he asked me to post his @ALSAssociation #IceBucketChallenge! Its hilarious!"

Rob began by thanking Zac, and he added, "I didnt have a bucket, youll notice I have to improvise." Rob proceeds to have a friend dump ice on his head while another pal blasts him with a powerful garden hose. Rob's buddies then pelt him with ice and spray him in the face again, and someone even throws a red Solo cup at the Twilight hunk.

R Pattz nominated Guy Pearce and Mia Wasikowska, and even though he bent the rules a bit on this, we have to say, we really enjoyed it...