Hah! That's pretty brilliant. Nicely done, Vimeo. OK, who else has awesome source-code easter eggs?
Click view source, there's a url too....
Unfortunately for the author, another student climbed the roof and discovered the 'experiment'. He reported it to a gym teacher, who was suspicious of what is was and subsequently called the Bomb Squad, therefore spoiling the graduation 'surprise'.
I wish people thought more before making comments like this.
First, there's a slideshow service being used. Most aspects of the slideshow come from the service's engine, not from the guy who did the presentation.
Second, there's no "line-break", much less it is "his". Get a larger monitor/device or enlarge the browser window. If you're seeing one, it's a hyphenation added by the slideshow service's CSS for widths under some size. Definitely not there for everybody, and definitely not "his".
Although I don't love/hate this post either way, the comments in here for the most part are just awful, classic HN middlebrow dismissal at its best mixed with a spattering of ad hominem.