Suzanne (and Varnes) … .I was just being a brat…...or teasing you, anyway….
The big F-U-N in colors was a picture.
I did a google image search for “the word fun”, found an appropriate one in a size that fit, and inserted it like any other image.
Ok, here’s an Australian version
(I never get tired of teasing our upside down friends…. LOL)