I watched My Dog Skip last night and even my 7 year old brother, who NEVER cries during movies, had tears streaming down his face. That one ALWAYS gets me.
Marley & Me... it's one of those movies that I always say "WHY did I do this to myself??!?!" because everytime it's on TV, I end up watching it 'til the end, and then cry by myself.
Hachiko... the one with Richard Gere, true story. I watched that by myself one night and was literally just bawling, holding my pillow tightly, LOL. I've never cried so hard.