Yes, that's Astros shortstop Marwin Gonzalez flying over first base for no apparent reason last night. As you can see in the video below, Gonzalez lunged to try to beat out a grounder, but he planted his left foot just in front of the bag, which suddenly propelled him skyward for a moment. And look at him go!
Gonzalez reportedly sprained his left ankle on the play, which totally sucks. But these are the Astros, and this is what they do. It's a shame about the injury, but there's just no keeping this play out of Houston's endless loop of summer follies.