This is one of the few parts to Pet Sounds that I already know - the opening piano figure for "You Still Believe in Me." I'm fairly certain I learned this in October last year, after discovering that the "You Still Believe in Me" on M. Ward's Transistor Radio is, in fact, the same "You Still Believe in Me," although arranged differently.
I don't have the same effect on this that's on the original. Off the top of my head, I don't remember exactly what it is, but I think it's something like holding down all of the keys and then hitting the strings, which is obviously something I can't do with an electronic keyboard.