There are lots of t‑shirts in the video for Justice's very good 'D.A.N.C.E.', a bit like that Basement Jaxx video with the t‑shirts in it but different because it's for another song and is also a different video.
httpv://www.youtube.com/watch?v=MENdMl-UAn8
One day they are going to invent ACTUAL t‑shirts which ACTUALLY do that when you walk around. We predict that day will be a Tuesday during October 2015 and will be the result of a horrible, horrible chemical disaster in the Hoxton area. It will be a sad day but good news for the world of t‑shirts.