I personally believe that James, Sirius, and Peter looked back on their first year and a half of knowing Remus with nostalgia, for one reason only. Sure, now they know him better since learning about his furry little problem, but Truth or Dare was a great time back in those days. Remus would never pick truth, so the craziest stuff that went down in the Gryffindor common room was because of this soft-spoken eleven year old screwing things up on a dare. After his secret was out, well… he never let the others go back.