: The episode highlights how much Sheldon has grown and the value of his current "found family". Subplot: Meeting Anu

: Sheldon eventually visits Tam in his office and "forgives" him, though Tam remains hilariously confused about the severity of the grudge.

When Tam reaches out to Sheldon after 20 years because he is visiting Caltech with his son, Sheldon is visibly upset. He reveals that Tam has been on his for decades.

: Sheldon's friends (Leonard, Howard, and Raj) are shocked to learn Sheldon had friends before them.

: The group tracks Tam down on campus, only to find that Tam has no idea why Sheldon is angry. The Truth: A Promise Broken Sheldon eventually reveals the source of his grudge to Amy:

Amy helps Sheldon see the situation from a different perspective, noting that if Tam had moved with him, Sheldon might never have bonded with Leonard and the rest of the gang.

: According to Sheldon's list, Tam simply "knows what he did".