Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: so one of my coworkers has his last day with the company today. we got him a card and a 15 dollar dunkin donuts gift card.

after i had written a message in the card i sent my coworker an email with other things i wanted to tell him before he left. i mentioned the card and he emailed me back saying "what card? spoiler alert lol" i wasn't aware that i had "spoiled" anything, we usually do something for colleagues who are going on to bigger and better things and a card is hardly a big surprise in my opinion. 

he announced once he got the card that i had told him about it and everyone laughed. i don't think anyone's mad, but i feel rather foolish.

TIFU by (kind of) ruining my coworker's surprise