There are two types here.. ones that you just can't finish because they just do not tickle your fancy... and the ones you just can't finish because it makes you so sad that it will be gone.
Cant Finish Because I do not like:
Woodford Four Grain
Can't Finish because I cannot get another:
EV Anabellum - man I love this stuff... probably won't finish it until I find another.
Others I need to think upon