The NFL on Fox asks an interesting question on Facebook -- the time peg being that Sunday is the 40th anniversary of "The Immaculate Reception."
If instant replay was used in 1972, the Immaculate Reception would have been ruled:
A catch, Steelers win.
Incomplete, Raiders win.
The play has long been controversial because of an obscure rule about which team touched the ball first (a rule that was later undone).
In any event, the catch/no-catch query is interesting in and of itself. What we are wondering in the comments is: What are some other great moments in sports history that might have gone the other way/been overturned if modern technology and rules were in place?