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Monoculus is tough for a floating eyeball with no big arms to slap you around with. But apparently he's no match for the TF2 community's passion and ability to kill floating eyeballs.
To up the ante, and to challenge those of you who can best Monoculus with one eye tied behind your back, now every time he is defeated, he becomes tougher when he respawns. Go get him! And remember, if he defeats you, it's considered proper etiquette to push away from your computer, ball up your fist, shake it at the ceiling, and shout "MONOCULUUUUUUUUUUUUUUUUS!" as loudly as you can. Don't worry about the police showing up. Well, worry inasmuch as they probably will show up. But once you explain the rules of etiquette to them, they'll likely understand.