The first person to ask me how I threw my neck out is going to get what Dwayne “The Rock” Johnson refers to as “an ice-cold can of whoop-ass.” I could make up a reason — while rescuing a fallen hiker on a fourteener, perhaps, or getting into a fistfight with a City Park goose — but the reality is so much more embarrassing: It happened at a press screening Thursday of “Fast & Furious Presents: Hobbs & Shaw” in 4DX. Last month, Regal UA Denver Pavilions quietly opened a new state-of-the-art 4DX movie theater.