For those of us who have sat through games in the nose bleeds, every once in a while it would be nice to have an instant replay of the prior play (preferrably from a better angle). As such, I propose that arenas begin renting out (with deposit) mini wireless lcd screens (about the size onboard an airplane) which can help fans keep up with the replays and potentially get live audio with a headset. This would enhance the experience, as spectators would have some entertainment between plays or pitches.
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I've thought of this as well while at games, but imagine that stadiums would be worried about beer being spilled on them, or the machines being broken some other way. The logistics of returns and payment might be too much to handle.