By the time Sam was 21, she found it pretty much impossible to imitate Danny. For some reason though, Danny still occasionally asked her to do it for him. She sometimes wondered precisely what it was that he saw that fascinated him about her old disguise.
Huh. Kind of has me thinking back to my latest Danny Phantom fanfic, "Royal Occupation". Set against the backdrop of Halloween, Sam takes up the Danny clothes again as her costume, for the express purpose of causing anyone to freak who happens to see her and Danny making out.
Well, that was one time on the show where Sam dressed as Danny. The other time was "Forever Phantom", the episode with Amorpho. But it was where I got the idea for Sam to dress up as Danny for Halloween in my fic. I have no doubt that she would have gotten a kick out of creeping people out, seeing her make out with Danny like that.