A cool-as-a-cucumber straphanger was captured on cellphone video completing a Rubik’s Cube in less than 30 seconds — with his eyes apparently closed.

In the captivating, now-viral clip, the man, wearing a “Dragon Ball Z” t-shirt, effortlessly solves the six-sided colorful cube as he tosses the famed toy from one hand to the other.

Street photographer Sheldon Serkin took the video of the man as he sat across from him on the train, posting it to Twitter on July 25 with the caption: “What the.”

The video has been retweeted more than 6,400 times and “liked” more than 13,600 times.

Twitter users were enthralled by the skills of the Rubik’s Cube guru.

“That guy’s just being awesome by being himself. Highest of fives to that dude,” @JustinTGann tweeted.

Another user, @septemberbleu, tweeted in response to the video: “Ok my head just exploded. I can’t.”