mobile-bannertablet-bannerdesktop-banner

Watch Mark Hamill Hilariously Prank Star Wars Fans in a Darth Vader Mask

May 03, 2017

Leading up to May 4 — the unofficial holiday known as Star Wars DayMark Hamill got in the galaxy far, far away spirit by pranking fans in the name of charity.

As part of a The Last Jedi Omaze campaign for Lucasfilm’s Star Wars: Force for Change initiative, the 65-year-old actor channeled both his own character, Luke Skywalker, and his inner Darth Vader to surprise fans who believed they were filming a video to celebrate Star Wars' 40th anniversary. As the participants performed reenactments of some of the saga's most iconic scenes, Hamill either snuck up behind them or donned a disguise to act alongside them, resulting in some hilarious reveals.

Those who donate to Force for Change — which benefits UNICEF and Starlight Children’s Foundation — will have a chance to win a night at Skywalker Ranch, a visit to the set of the upcoming Han Solo movie, a trip to The Last Jedi premiere or a lunch with Hamill himself.

Watch the video below.

All products and services featured are based solely on editorial selection. TIME may receive compensation for some links to products and services on this website.