Fireworks go off all at once

This video clearly shows what happens when a fireworks display accidentally goes up all at once.

The Italian fireworks accident was taped earlier this year, but just posted to YouTube.

Also today on Trending Now, actor Nathan Fillion admits to Jimmy Kimmel he is very worried about the zombi apocalypse. Race car driver Alex Zanardi talks to David Letterman about the doctor who saved his life following a crash in Germany. Jim Carrey is on The Ellen Show promoting his new movie "Dumb and Dumber To." Channing Tatum plays Box of Lies with Jimmy Fallon on The Tonight Show. And, John Lithgow shows off his amazing Yoda impression on Late Night with Seth Meyers.

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