Bruno Mars would do anything for his girl in the video for “Grenade”—including lugging a piano across town. In the 43-second teaser for the clip for the second single off his debut Doo-Wops & Hooligans, the “Just the Way You Are” singer suits up in a spiffy ensemble, struggling as he pushes the heavy object up a bridge and pulls it down the highway. The full video debuts Friday on MTV.