Ha! See what I did with the hands? --Trying to make it more convincing.
Rather brilliant I thought.
For Dr. Seuss... I found this pic of David Strathairn that made me think he could do it:
...but there's also someone else... and I can't think of the name of the actor right now, I'll probably remember his name around 3 am or something lol.
(Edited because I misspelled David Strathairn's name the first time... /facepalm)