Lag Fighting
You’re trying to fight someone on AIM or Facebook Chat, but you take so long to type your message that they already said something else and you just send it when the whole conversation has moved on.
You type 'I’m still mad' after they said 'I’m going to get pizza' and they never came back.
You send 'I told you so' after they said 'I’m going to beat you up' and then they just left.
You type 'I’m not done yet' when they said 'I’m going to bed' and they ignored you.