Years ago, the great voice actor Frank Welker gave me a video of him doing celebrity impressions for celebrities — imitating William F. Buckley in front of William F. Buckley, imitating Mort Sahl in front of Mort Sahl, imitating George Burns for George Burns, etc. To do this, you have to be real good and real gutsy.
Here's voice actor Brian Hull wandering around Disneyland doing Disney voices for the characters he'd imitating. This is a bit different and I suspect the folks in the costumes didn't know what to make of him. It's too bad we couldn't see their faces…
By the way: Brian will be one of the panelists on the Cartoon Voices panel I'm doing at WonderCon Anaheim on Saturday, the second day of the con. As you can see, he's really an amazing talent.