This post has been all over tumblr for the past couple of days:

I had my doubts about this, considering how old it would get for the performers — especially once it went viral on Tumblr and Pinterest and people started yelling it at the characters every few minutes.
Yesterday I received this ask:

So I looked into it a bit more.
The video above gives you your answer.
When it did work, it would most likely depend on multiple factors. It would depend on who was in the costume and what kind of mood they were in, whether they were surrounded with kids who they may fall onto, how dirty/wet the ground was where they were, etc. It would look really bad to finish their set with mud and dirt all over their outfits.
And can you imagine Buzz even attempting to do this in his hard plastic costume? It would get all scuffed up, and he may not be able to stand back up without assistance.

(photo source)
So if you go to the parks and visit the Toy Story characters and yell this, they’re probably just going to ignore it. Or you may have a cast member come over to tell you that your endeavor will be fruitless. The characters may stop moving for a moment if they feel like playing along, but they’re not going to suddenly drop to the ground.
I can just picture people who saw this online yelling it over and over again and getting upset when it doesn’t work and driving everyone crazy.
Don’t be that person. Character performers work hard enough without people making their jobs harder because they believe everything they read on the internet.
Yeah guys, please don’t be that person. Lol.