Gav and Dan revisit an absolute classic with a slight twist. Now in 4K! Watch the original here - Follow Gav on .br Follow on Twitter! - Watch this one in HD! The slow mo guys are well aware that water balloons are always good in slow motion.br Gav and Dan start a water balloon fight with over a thousand people and film it at 2500fps. It does not end well for them. Follow Gav on Twitter .br AMAZING!!! The second pop looked like a huge dinosaur swallowing something! Watch Previous Video: Find us on Facebook: .