But this one might be the most unusual of them all.
Reddit user djwiseiv posted a picture of his tribute to Williams on Imgur, and it's pretty incredible: it's a tattoo of Mrs. Doubtfire holding a lime, while the famous line "It was a run by fruiting" is imprinted below. It's an homage to one of the most memorable scenes in the movie, where Williams throws the lime at Pierce Brosnan's character at the pool.
The tattoo was done by the user's friend, who is a tattoo artist, according to the image's caption.
The colorful tattoo, done in a cartoonish style, is definitely one of the stranger ways fans have expressed their love for one of Williams' most popular movies (it was the number one movie on Amazon for much of the past week), but all-in-all, we'd say it's a fitting tribute from a big fan.