People.com Entertainment Movies A Superhero Never Rests: Robert Downey Jr. Posts Funny 'Iron Man' -Themed Labor Day Message Robert Downey Jr. threw it back to 2010's Iron Man 2 to wish his fans a happy Labor Day on social media By Lindsay Kimble Lindsay Kimble Lindsay Kimble is a Senior Digital News Editor and the Sports Editor for PEOPLE Digital. She's worked at PEOPLE for over seven years as a writer, reporter and editor across our Entertainment, Lifestyle and News teams, covering everything from the Super Bowl to the Met Gala. She's been nominated for the ASME NEXT Awards for Journalists Under 30, and previously wrote for Us Weekly while on staff at Wenner Media. People Editorial Guidelines Published on September 7, 2015 04:20 PM Share Tweet Pin Email Photo: Marvel; Getty It may be a holiday in America, but that doesn’t mean Tony Stark is taking a day off. Robert Downey Jr. took to social media on Sunday to assure fans that his Marvel character, Iron Man, wasn’t sleeping on the job this Labor Day. “Hope you’re all having a restful weekend,” Downey wrote on Twitter. “I’ll stay online in the workshop (as machining is my passion). #LaborDay.” Alongside the message, the actor shared a still from 2010’s Iron Man 2 of Stark toiling away on his impressive (and fictional) technological hardware. VIDEO: Robert Downey Jr.’s Changing Looks The 50-year-old has paid tribute to his most iconic role on social media before. Just last month, he and Iron Man franchise co-star Gwyneth Paltrow exchanged Internet references to their characters. First, Downey shared a fan-made image of Stark and his counterpart. A few days later, Paltrow took a selfie with the actor, using the pair’s onscreen couple name “#pepperony” to caption the picture.