It was a case of two Efrons for the price of one when teen favourite Zac shared a video of himself and his brother, Dylan, bungee jumping.
The High School Musical star, 33, shared the treat with his 46m followers on Instagram and can be seen shirtless with his younger sibling, 29, taking a flying leap into the air screaming excitedly.
The pair were spending time together to celebrate Brother's Day, which is held in the US on May 24.
Zac had his cap on while he took the jump, which was soon seen flying off as he came closer to the ground. The actor posted the video with the caption: “I can’t tell who’s screaming, him or me.”
The video caused quite a stir on social media, causing one viewer to muse whether "Zac Efron upside down is even hotter than Zac Efron right side up?"
Even actress Jessica Alba, who called the experience “terrifying”, posted, “So many abs – so little time”.
The hunky siblings are no strangers to showing off their matching muscles, however Zac's latest appearance has set Twitter abuzz, days after his reported 'split' with his girlfriend Vanessa Valladares over her possible casting in a controversial new show.
The actor took part in the Earth Day! The Musical, which had just aired on Facebook.
Zac seems to have a more squared out jawline in the video, and his legion of fans were quick to notice.
Not only that, but the Hollywood heartthrob appears to have even more muscle than before.
The internet was awash with comments and his new look left fans a bit confused.
“I refuse to believe this is Zac Efron,” one wrote.
“I woke up and zac efron got botched wtf im so devastated,” another said.
The teen favourite starred in the hugely successful High School Musical alongside his ex girlfriend Vanessa Hudgens, before going on to feature in other films including Charlie St Cloud and Baywatch.
Zak's brother Dylan is also an actor and has starred in films including Ready Player One and The Accountant.
