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1.
emotionally hijack:

- the act of deliberately and successfully changing a particular person's (or group's) mood
Ex.1
Jim: We were having a great time, everyone was laughing their asses off, and then Karen walked in.
Bob: Let me guess, Karen started with her nonsense, emotionally hijacked everyone and ruined the mood.

Ex.2
Jim: Man, I was having a bad day, and then Glenn came in for a chat.
Bob: Let me guess, Glenn emotionally hijacked you and you had a super day!

Ex.3
The people who profit from 'mood disorders' do not believe in the fact that emotionally hijacking occurs all the time.
by GlennyJ December 12, 2013