Henry Kuttner & C L Moore's "All is Illusion" (short story, humor, free): Never pick up a fight with a magician...
And the fun begins... others sometime get a foul smell out of him but he himself cannot smell it, others hear funny noises from his stomach when he cannot, other see a duck or a horse where he is, ...
Fact sheet.First published: Unknown, April 1940.
Read online at UNZ.
Note: If you are using an Android tablet, here is a way to pick up this file as a pdf from Google Drive: note 1 & note 2. This method doesn't, however, work at least in my Firefox on Windows XP, & Android browsers don't let me copy the URL of pdf.
Related: Stories of Henry Kuttner, C L Moore.