I really don't think there is much I find more irritating on the net than pop - ups! Especially when they are ones for smutty sites - several times I haven't been looking and clicked only to be asked "Are you over 18"!! I do have a pop up blocker which works well but on some sites I need my blocker off and forget to put it back on again! Spam is bad enough but pop-ups just appear when you least expect them, thrust into your face like some jack-in-a-box!!! I wish someone would just ban them from the net forever!!