This comic is exactly the same premise as comic 292. Person innocently thinks a minor mistake will be harmless, it ends up being catastrophic. The rhythm is even disturbingly close - even to the point of having the third of four panels have no border. Read them both together - it's crazy! The blood everywhere after a seemingly innocent action is also very reminiscent of comic 419.
Anyway, it just kind of feels like he needed to fill in space between his Epic Story Of Magical Awesomeness and his Post Election Comic Spectacular That Turned Out To Be Nothing Special so he went for some tired old everyone-jokes-about-this-their-junior-year joke.