Continuing the previous post...
1] The newspaper.
2] Anti-religious or angry blogs and websites.
3] Comments on any site.
4] Looking at immodest pictures.
5] Lashon hara.
6] Advertisements - They put in your mind to want things you don't need and/or can't afford.
7] Footnotes [It doesn't get your mood low but your eyes go low:-)].