I was playing Tirean and we had some network problems ending in desync. Chat did only seem to work sporadically, i.e. most of the time i did not see my own messages.
I was wandering why he was calling me spammer and crazy guy, then i realized that the messages actually reached him but are not displayed in my window. Quite embarrassing.

Just to be clear, the messages were not delayed (as usual when the storm comes) but appeared lost on my side.