Photoshopping news photos
A Philadelphia NBC news page is illustrated with one of the sloppiest Photoshop jobs I've ever seen. They wanted a shot of a muzzle loading cannon firing. So they took a shot of some re-enactors with a cannon, and spliced in a muzzle flash.
1) If they knew anything about cannons, they'd realize the tampion is still plugging the barrel as the gun supposedly fires.
2) And they'd know there should be some smoke.
3) Not to mention that the armor plate and hydraulic recoil absorber suggest that this is a 20th century
Hat tip to reader J Bryan Krämer.