Can you see an advertisment banner in the top of this page? If do not see, you can see it sometimes. That is publicity of screensavers.com and there are some characters from the film of spider-man. There is a note "shoot a target" and as a target is shown some character. That note is blinking. I think that for some people who have AS or some other disorder it can cause a fret and whish to stop that blinking by pushing it. Or that just cause a whish to push it. Banner do not cause to me any emotions but I think that it can cause something for people who have for example OCD.
p.s. perhaps the authors of a banner specialy put this banner in such a forum?