If you are looking for specific dialogue types used in these videos, they generally follow these patterns:
A rapid-fire montage of several participants reacting immediately before or after the splash. 100 People Get Splashed in the Face | Keep it 100 | Cut
"Is it cold? Please tell me it's not cold water." If you are looking for specific dialogue types
"I just spent forty minutes on this makeup. This is a crime." 100 People Get Splashed in the Face | Keep it 100 | Cut
You can find more episodes and similar social experiments on the official Keep it 100 Playlist on YouTube.