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So, a crapload of different anime/manga/etc. characters were involved in an Extreme Tennis Tournament (Tennis played on the top of a skyscraper, with baseballs instead of tennis balls, and teams ranging from 2 to 15 players playing all at once.
(For example, a team of 3 would play against a team of 12, and everyone would be on the court).
And all teams were of characters from a specific anime. So there was an Azumanga Daioh team, a Sayonara Zetsubou Sensei team, a Naruto team etc.

And the final match was to be played by the Hetalia team (Consisting of about 15 players. Won't bother naming every character) against the Death Note team (Which only consisted of L and Light, since everyone else had fallen off the edge of the building).

After a while of playing, there was only 2 minutes left and the Hetalia team were in front by... well, a lot. L started getting stressed out over it to the point where he was about to burst into tears, however, one of the rules of the game was that if any player starts crying at any point during the match, they're disqualified. So to avoid being disqualified, L intentionally jumped in front of the ball, so it would hit him on the head and knock him unconscious. Which worked, and resulted in the famous Light-grinning-at-L-as-he-closed-his-eyes sequence (Only, Light was grinning because he couldn't believe how much of a wuss L was). Even after L recovered, he still pretended to be dead, so no-one would notice Light scoring the rest of the points. But their team/duo lost either way.

After the game ended, one of the spectators commented on L pretending to be dead, and Light told him it was okay to wake up now. L just ignored him and continued pretending to be dead. Which eventually annoyed Light to the point where he flung L off the top of the skyscraper.