I find it annoying when you're in the middle of RP, or in the middle of typing something out and BAM you lose connection from the map, you crash or Your laptop runs out of battery and you have to restart it all over again. ;-;
I also hate it when You're just sitting there minding your own business, talking with friends or whatever, and someone who you spoke with the other day, see's you and claims you're their mate like... 'What? O.o'
But other times it just makes me laugh because they're fail trolls