The worst is when the application activates itself but isn't actually done loading or ready for user input. It's like the spam call I received once that immediately asked me to hold for the next available operator when I picked up the phone.
microsoft teams is the worst for this. It'll be loading for 10s, during which it will actually steal focus _multiple times_! (and then I have to login to my university account in order to logOUT of my university account so that I can login to my work account. What a marvelous piece of engineering.)
