In the Drum, Clara Oswald prompted the Doctor to use the cards to respond appropriately to the death of Jonathan Moran, who was the crew's friend, after the Doctor became giddy with excitement about the apparent "proper" existence of ghosts in the Drum.
Some of the apologies on the cards included: "I completely understand why it was difficult not to get captured"; "It was my fault, I should have known you didn't live in Aberdeen"; "I didn't mean to imply that I don't care"; "No-one is going to be eaten/vapourised/exterminated/upgraded/mortally wounded[/]turned to jelly[.] We'll all get out of this unharmed"; and "I'm very sorry for your loss. I'll do all I can to solve the death of your friend/family member/pet." (TV: Under the Lake)
One of the apologies read: "Good work! You tried your hardest to stop an alien plot, invasion or mystery. Delete as appropriate. But this time you were unsuccessful." The Twelfth Doctor read it verbatim to Ross and Amber after they failed to stop the Autons. (PROSE: Baby Sleepy Face)