Doctor Who (2007) - "What's that?" "... A gas mask!"
From the start of the episode at 4 minutes, 45 seconds in to 5 minutes 36 seconds there is a scene where Saxon puts a gas mask on, but when he answers the question of what it is at 4:50-4:52, the mask is now on upside down with the emblem on the top of the mask and not the bottom. The rest of the scene has it facing with the emblem on the bottom.
See the examples below and post your pictures
|Mask being put on at 4:47
||Mask upside down at 5:01
||The mask is back to normal just a second later.
new Doctor Who series, season 3, episode 12, The Sound of Drums