Creator Breakdown: Gerard's past battle with drug addiction and alcoholism are well-known among the fanbase. He's gotten a lot better, though.
This was also likely the case during the creation of The Black Parade, apparently thanks to working and staying at the Paramour Mansion.
This was definitely the case, at least for Mikey. He considered suicide or leaving the band as his only options for a while. Luckily, he got better.
Dyeing for Your Art: While Gerard tends to do this, most people seem to overlook the fact that Frank Iero has also had a habit of changing his hair.
Bleached his hair white for The Black Parade, mimicking the Disease Bleach of The Patient's hair.
Now for Danger Days, his hair is atomic red to portrait his punk-outlaw character Party Poison
Executive Meddling: When the "Teenagers" video originally aired on MTV, it suffered quite a bit of editing, since it came out right around the time of the Virginia Tech shootings. You can find the unedited version on their YouTube channel.