She-Hulk, we need to talk about your thing...

(The Sensational She-Hulk #33 by John Byrne)

-Classic.

Bill Mantlo, The Spectacular Spider-Man?

Okay, so you all remember one of the big play-ground rumors back in the day, that you had no way of knowing wasn't true at the time, about how The Human Torch was replaced by H.E.R.B.I.E. in the Fantastic Four cartoon because they were afraid  kids would light themselves on fire.  -Same thing was said about Spider-Man and His Amazing Friends having Firestar instead of Ol' Match-head.
There's also the one that seems to come up every few years- you'll hear about some kid who died after trying to fly like Superman and jumping off of a building/out of a window. (I first heard this one in reference to why the 1988 Superman cartoon was canceled.) I tried searching the interwebs to see if it has ever REALLY happened... and I could only find this one, rather recent, instance.
I only bring these up because I want them fresh in your mind...

~The Sensational She-Hulk:

-Do I have your attention?

Superman (Part 2)

~Superman doesn't kill.

(From the Arkham storyline: Superman #160 by Jeph Loeb and Ed McGuinness)

-I said that already!

Emerald Thursday:

~Just look at this sickening display from Deathlok #17 (by Gregory Wright and Walter McDaniel):

 Okay, okay- I added the heart- BUT IT WAS IMPLIED!