I can image Remus being that one that makes jokes and even though he makes them all the time, the rest of the Marauders are always like: Ohmigod Remus made a joke! Because they couldn't imagine it ever happening
The Marauders - I just realized. Rowling say they only worked on becoming animagi during the school year? What if that month with the mandrake leaf on their tounge was over summer? Imagine how their parents would react!