Harmy said:
The Lord of the Rings trilogy is a nice example of a double dip...
So far, they just dipped once, when the EEs get released they will dip the 2nd time (and probably 3rd and 4th too, as I expect the EEs to be 3 ultra expensive separate boxes, one for each film).
A double-dip is the exact same movie released twice.
The EE's wouldn't be considered a double dip.