In this paper I establish a normative limit of spectator interaction. I argue that attempts by non-participants (e.g. spectators) to affect the outcome of a contest, whether intended or merely foreseeable, are unsporting and ought to be discouraged because they undermine fairness, which is a fundamental premise of ideal competition. Because this is at odds with the participatory ethos of contemporary sports fanaticism (e.g. ?12th man? campaigns, visual distractions by spectators, etcetera) I anticipate several potential objections. I refute concerns that (...) my thesis is empirically dubious; that it is impractical; that it is subordinate to financial considerations; that it is nullified by participant acquiescence; and that it is subordinate to spectator interests. (shrink)