In Super Mario Bros. 3, you could go behind the solid blocks by holding down while on a white one. By my calculation, that would be Mario being capable of moving in three dimensions: up-down, left right, and some motion (albeit very limited) in screen depth. That would make 1988 the first appearance of 3D motion in a Mario game. SMW also let you go on both sides of those metal grates. This is nothing new!

"..journals are full of reports regarding the bad taste and tough meat of the dodo, while other local species such as the Red Rail were praised for their taste. However, when humans first arrived on Mauritius, they also brought with them other animals that had not existed on the island before, including dogs, pigs, cats, rats, and Crab-eating Macaques, which plundered the dodo nests, while humans destroyed the forests where the birds made their homes." [wikipedia.org] We didn't eat them into extinction, we simply caused it.

Oh good, I thought I was the only person who understood what he was talking about.

Thank you! Geez I was reading through all the comments waiting for this one. I can't believe Ludicrous speed wasn't the first one said! MAYBE warp, but Ludicrous is the funniest in my book.