This was the original Mr. Mxyzptlk drawn in 1950, by cartoonist Wayne Boring
I don't remember him looking this evil in the D. C. universe, but everything gets a reboot, and maybe this was for the Marvel appearance or the Crisis on Infinite Earths reboot, which is far afield from where I started out, so investigate at your own peril.
Sadly enough, the release of the 3rd film here in the U.S. saw a massacre in Aurora Colorado, on July 20, 2012. As of this posting, the alleged shooter, James, Holmes, was at first, deemed mentally unfit to stand trial. Several pre-trial motions and filings on both sides were filed, as they each tried to gain the upper ground.