On Scorpion Season 3 Episode 18, Happy discovered Ada was in danger after she failed to respond to one of Happy's online messages. Granted, it is Scorpion, and they aren't known for dark/heavy cases of the week, but Ada dying was a lot more believable than any situation where we were supposed to believe that a member of Team Scorpion would die. Happy's personal connection with Ada not only gave us some great Happy scenes, but it improved the case.