I would not be surprised if an easter egg exists on xkcd.com provided you satisfy these requirements.

Aha, especially the boat mode.

	▲	Lutzb 3 days ago \| parent [-]
		Maybe something like > Mozilla/4.0 [en] (AppleIIGS; U; P3±1-emu; 1024x1; BoatMode; CapsLk)