I hate it when this happens because I feel like they just plain ignore me, and the fact that they "don't notice" is frustrating because I was raised to always be the one who has to pay attention and notice everything. So I'm also angry because I'm realising that the people who took my seat are "allowed" to be relaxed about life while I can't. Also then I feel guilty because I'm angry and "so serious about it" and just become passive-aggressive...