Now that was not acceptable humor: that is bad taste. As for Muhammad cartoons? Hilarious

"Francois Cavanna was the publication's founding editor in chief, back when it was called Hara-Kiri. He was the one who renamed it Charlie Hebdo in 1970, after Hara-Kiri was banned for publishing this cover, which used the death of Charles de Gaulle to spoof press coverage of a nightclub fire that took 146 lives. ("Tragic Ball at Colombey, One Dead," read the coverline.)" (thanks Amir)