After Silas's ride on Big Thunder Mountain Railroad went less than well, Ben's been "preparing" him for the Matterhorn (I haven't even asked) -- giving him the play-by-play, watching the ride on YouTube. The climax of the roller coaster for a 3 year old, of course, is when the giant monster with red eyes (red eyes, as I've mentioned, are particularly terrifying) roars.
When they were talking it over, Ben asked, Silas, what's that monster's name?
... a moment of thought....
The Obama Snowman.
(also known as the Abominable Snowman)