IFR fake?

[Robert Goodman]

Fly balls can be hard to judge from behind their flight path. Do umpires ever get faked by fielders into drawing an IFR call on a deep fly ball? If after calling the batter out (say if the umpire's working solo behind the plate), an umpire sees the ball leave the field in a place that would otherwise result in a home run, is he allowed to reverse the "out" call?

Would it be unsportsmanlike conduct for fielders to move toward a shallow spot in an attempt to draw an IFR call? Or would you never presume it to be the umpire who's the target of such fakery rather than the opponents?

If you were in that plate umpire's position, would you try to delay making an IFR call until you saw baserunners playing halfway?