system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are all the audience guests at shows like Ellen/Oprah jump / scream hysterically in pretty much the same way? Is it directed? Are they cherry picked based on their "enthusiasm" level? Or do all people behave like this naturally when getting a free gift / meeting a celebrity in a TV show?

Is it directed this way? Statistically speaking, I'm sure some of the guest audience people would normally be less "energetic" than what we see. But it seems each and every one of them behaves in the same "extremely happy" way. Screams, jumps, OMG OMG OMG etc. No offense or any judgement, but I find it weird that all of them behave the same way. Is that just edited to keep only the most "happy" guests? do they pick them in advance like that? do they just "play the part"? some of these people are school principals, doctors, nurses, engineers and people who are not usually "acting like a teenager meeting Justin Bieber", how come the show editores always get a very real looking reaction from the guests?

EDIT: Just to clarify, I mean the non-professional actor / non-celebrity "Single Mom from Detroit" type of "surprise you are selected to play '3 seconds rule' or something" or "a viewer who wrote us a letter doesn't know we are going to knock on their door in 1,2,3" type of guests... 

Thanks!
gpt
They are very much encouraged to be this wild and enthusiatic.Most shows have someone "warm up" the audience before tapping. As for the guests, remember, most are professional performers, have done these shows for years and know the drill, it's all an act.