I hear ya'. When I visit railpictures.net, often there are pop-ups / pop-unders that come up (even though I have Firefox's pop-up blocker enabled), and if I attempt to close them it either spawns another pop-up or brings up a dialog box asking me if I'm really sure that I want to close it, and if I click OK, sometimes yet another dialog box will come up. Unbelievably annoying. Who in their right mind would actually purchase a product or service from a company that uses that type of advertising tactic?
At least the banner ads here on railroad.net aren't ambushing us!
Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
Central Maine & Quebec/Montreal, Maine & Atlantic/Bangor & Aroostook
Providence & Worcester — New England — GE Locomotives