What was the name of this show on Nickelodeon?

It was on Nickelodeon when I was growing up (1980's). It had mostly teenage kids doing skits kind of like SNL only for young kids & each show would have a topic. Whenever someone said "I don't know" they were "slimed" with green stuff & whenever they said "water" in a skit they were hosed down with water from the ceiling. What was the darn name LOL? It's on the tip of my tongue.help please?