Jimmy Fallon's Late Night Hashtags: 'I Used To Think' (VIDEO)

WATCH: The Funniest #IUsedToThink Tweets

In this latest round of Jimmy Fallon's "Late Night Hashtags," the host asked people to tweet the things they used to think were true.

You know, like when you were a kid and used to pretend that the floor was lava. Or when you were an adult and thought Ellen's last name was The Generous.

Using the Twitter hashtag #IUsedToThink, the game became a trending topic in the U.S. in under 30 minutes, so you know there were some good ones. Watch the video above to hear Fallon read his favorites.

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