Biggest tear jerker for me:
Admiral Forrest's death in ENT.
Not only is Vaughn Armstrong my favorite actor of all time, but Forrest always reminded me of my father. When Forrest died, it was almost like if my dad had died. (Fortunately my dad is still very much alive, but watching Forrest die was almost like the "real thing", as it were.)
And you know, the MU Forrest's death hit me the same way. Because in both universes, Forrest was basically an honorable sort; both versions died while saving others' lives. Is that cool, or what?