OMG... I hate those things...
Last weekend, I was taking the ferry from Selbina to Mhaura, and one guy on the boat started spamming "ne1 went 2 gamble? Com up on dek!" After shouting that 3-4 times every 10 seconds, one of his friends got into the mood. "C'mon! Let's have sum fun!" In the end, they got two other players interested...
Of course, they were right in the middle of the deck, so anywhere I went, I just kept hearing them doing /random, /emotes, /says and /shouts... Man, I turned on all my filters, save for my /linkshell and battle ones so I wouldn't go mad for the duration of the trip.
I admit I secretly wished a Sea Horror would spam right above their heads. ...Never happened.