[ConservativeTeen]

I think I cracked up for five minutes straight when I saw that scene for the first time, so terrible.

[Army Air Corps]

Part of the laughter is the fact that your brain continues to ask, "Did I really see that?" Also, I recommend Starcrash for some cheesy 1970s fun; the full movie is available on YouTube. You should also look at the Internet Archive's vault of public domain movies - lost of stuff in there that was riffed on MST3K. The URL for the Internet Archive is archive.org.