A passenger who appeared to be experiencing a mental health crisis punched out the plexiglass of a window mid-flight.

"He was scary," a witness said. "He started kicking profusely and started punching the window." Passengers on board restrained the man with the only tools they had available: zip ties and a shoelace.

A Frontier Airlines passenger was restrained on the airline's Flight 4856 from Denver to Houston after he was screaming and punching the aircraft's windows on Tuesday, Feb. 4.

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Forced inside to the Capitol Rotunda by frigid temperatures ... The day’s pomp and unusual circumstances made for a lot of close-up encounters between political combatants, some awkward ...

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