United States of Tara/Heartwarming

"Max: If you're Tara, then I'm Max. If you're Gimme, then I'm Gotcha. If you're Buck, I'll be your bike. If you're Alice, then I'll be your astronaut. And if you're Chicken, I'll carry you to the car even when you're pretending to be asleep."
 * Tara and Max making up in the season 2 finale.

"Kate: If you fuck this up for her, you fuck this up for me and I need her to do this, you hear me?! I need her to do this! Don't take this away from her, don't take this away from us! [Tara ] Kate: Mommy?"
 * Marshall kissing Lionel's eyebrows is one of the gentlest and most heartwarming moments of season 2, especially since that scene abruptly follows our first glimpse into Lionel's possibly abusive/neglectful home life.
 * The entire ending of "Cracker Jack", when Kate  and screamed that Tara has worked too hard to get better for T to mess everything up. T   and she transitioned back to Tara;  . So heartwarming that it's tear inducing.

"Marshall [hugging Tara]: Don't let them scrape out your good parts. Tara [grabs Kate into the hug]: You are my good parts."
 * The series finale, "The Good Parts". Particularly at the end when the episode's Title Drop is made..