We Were A-Mazing

Above is a 3D maze with a small ball-bearing inside it. There are various twists and turns you must navigate to get to the finish which are all numbered, and they go up to 100. There are 90 degree and 180 degree turns, swinging arms, flip floppy buckets to drop the ball into and all sorts of other devilish little tricks to confuse those who prefer a 2D world. It is utterly brilliant. Because I'm not at all a nerd, when the bloke who owns it brought it in to work, I wasn't at all forced to finish it before anyone else and did not feel inordinately proud of myself, at all, for doing it. Not one little bit. 

I will admit to one thing, though. And I'm sorry to say you are either going to get this, or not. There's no explaining it. Through the entire exercise, I was singing, "One two three four five... six seven eight nine ten... eleven, twelve, Do do do dooo do du du.