While everyone is already watching their screenings of Avengers: Endgame this weekend, a specific movie theater in Singapore gave out an extra memento for its attendees, thanking them for their ticket purchases.

Business Insider Singapore is reporting that a moviegoer by Reddit name @bernard1994 found a special Avengers coin stuck under his seat. The medallion, featuring the movie’s “A” logo embossed on its face, is colored “Thanos purple” and roughly 2” inches in diameter. The recipient wrote “anyone else who got a free Avengers Endgame coin stuck under their seat? Got mine at The Cathay 6.30pm show on opening night.” on his post on Reddit.

The marketing campaign apparently wasn’t as transparent as it could have been, as his friends and many others were unaware of the promotion, however the theater confirmed to Business Insider Singapore that 134 Cathay Cineplex attendees received the coin for the 6:30pm screening exclusively. A spokesperson for Cathay Cineplexes explains that “this was a surprise giveaway for the fans, and this particular hall and show time was selected, as it was one of the first few halls that was completely sold out during the advance ticket sales period.” In addition, one very lucky attendee received a gold version, which also came with a set of Marvel collectibles.

Singapore wasn’t the only one to receive this rare coin; specific Cinemark Theaters across the US also partook in the campaign, as revealed in the official tweet below.

Do whatever it takes to attend our #Avengers: Endgame Opening Night Fan Event at select locations! See the movie early, get your collectible coin and a free medium popcorn! Tickets: https://t.co/iukc9ptmsd pic.twitter.com/zeys3tyLmz

— Cinemark Theatres (@Cinemark) April 2, 2019

A quick search on eBay shows that the coin is reaching the resell market, with the highest priced sale currently set at $150 USD.

Avengers: Endgame is out now in theaters worldwide. Read more about the box office records the film has broken so far.