It was all treat and no trick for a group of young musicians rocking out in their garage last week, as Imagine Dragons singer Dan Reynolds passed by and joined them for an impromptu jam.

According to TMZ, Reynolds was out trick or treating with his wife and kids in Las Vegas when he happened upon the three musicians, who dubbed themselves Streetfolkband, who were playing in their driveway.

The vocalist was immediately spotted by the musicians, who asked if he'd join them for a jam. Reynolds reportedly asked the group if they knew any Imagine Dragons songs, and it wasn't long before garage rockers were playing "Radioactive" with the song's vocalist.

Reynolds sang the whole song with the group, all while holding his toddler. While the vocalist was offered a high five by the band's guitarist, he offered a hug instead. Watch footage of the impromptu jam in the tweet below.

20 Best Selling Hard Rock + Metal Albums in the United States: