Guy Incognito is one of the best examples of the greatness of the jokes in classic era Simpsons, because of all the components that sell the bit:
-The exaggerated Homer voice Dan uses
-The finger waggle
-"Ho-mer? Who is Ho-mer?"
And of course, the reveal itself (followed up with the puffy tail dog)
One of my favorite gags was when Bart and Homer are shopping for a new TV and they're all bootlegs with goofy names. I can't not say "Sorny" when Sony comes up especially when talking about TVs lol