Arcade Fire are big on disguises and throwing the audience for a loop, and the masked antics during their two Coachella 2014 sets were no exception.

For their first weekend at Coachella, Arcade Fire brought Debbie Harry and the Preservation Hall Jazz Band into the fray, blasting through "Heart of Glass" with the Blondie bombshell and giving their finale a jazz twist with the help of New Orleans' unofficial house band.

At the close of Weekend 2, Beck—who'd covered Arcade Fire's "Rebellion (Lies)" earlier that afternoon—joined them onstage for a cover of Prince's "Controversy." But Beck was only one of the "very special guests" Arcade Fire promised to their Coachella-closing crowd... or was he?

Arcade Fire's Win Butler introduced a duo as "Paft Dunk" before a pair of guys rocking Daft Punk's infamous robot helmets made their way to the stage and launched into a slowed-way-down version of "Get Lucky" before getting cut off by Butler himself. (Here's hoping they didn't drop too much cash on their headgear.) 

The posers nearly passed, as plenty of Coachella-goers thought the guys in the helmets were the real deal, but alas, it looks like Beck was the only big name to help Arcade Fire put the finishing touches on Coachella 2014. 

Consequence of Sound reports the two people who joined AF on stage were not "the same height or weight as the real McCoy," nor did they even push buttons on the consoles in front of them. Plus, any Daft Punk sighting should always be taken with a great deal of suspicion. Regardless, you can watch the "performance" above.