seeing repeats

Hi,  I have two problems, and one solution for both. 

Repeats:  I feel like I have to come back often, because you only show 20. But then if I come back too quickly, it's mostly repeats. 

Never see again:  There are some that I would like to never see again. These are the flashing ones that give me migraines, and the horror movie ones that give men nightmares.  If there was a clickable Never Show Me This Again button, that would be awesome. This would also fix the previous problem.