Pop-ups on Android while using website ?

Yesterday, for the first time that I can remember pop-ups that consumed entire page without ability to close appeared while on tabletpcreview forums. Wish I could remember the subject. Anybody else experience ?

 

I'm getting them 100% of the time on iOS now... "Congratulations, you have won...". Whatever I do, it just keeps going to that ad which can't be cleared. The site is unusable with this ad.