I can be goofy and silly...with people that I know well. I LOVE to laugh and to make other people laugh. My INFP husband always said he was "weird and goofy" before getting together with me...but now, he is so out there that if I left him, he probably couldn't find anyone who would want him!
My INTJ boss used to be really serious when I first started working for him...and things were a little awkward between us. Now we are both silly and goofy and laugh a lot!