Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Me, Emma and Karen (fake names) are housemates and we always keep some spare keys to our house under a flowerpot in our garden in case anyone forgets their keys or for guests who are staying over at ours to help themselves in.

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This week I have had a guest over, Elisa. Elisa has been using the keys to come back home at night before the rest of us arrive (we all work late hours) and put them back there after every use. Starting yesterday, Emma is having a friend of hers (Robert) stay in her room to visit the city while she is away on a business trip. She told him about the keys so that he could use them too.

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At 8:50 p.m., my guest called me saying the keys were not under the pot any more, there was no one at home and she couldn’t get in. I am at my office, which is a 1.5 hour commute away and I still wasn’t done with work. I message my housemates asking where the keys are. It turns out that the other guest has taken them with him and is now having dinner with Karen and some friends 40 minutes away from home. I tell Karen to tell him to go home and open the door for my guest, because otherwise my guest will have to wait for me to get back to go in (10:30+). She tells me he is having dinner. To that I replied that he could resume the dinner later.

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They stopped replying to my messages and in the end my guest had to wait until I arrived at 10:30pm to go in. Robert turned up at 11:20.  
 

My flatmates now say IATA for expecting Robert to go open the door. They say that I should have told my guest to go to their restaurant to pick up the keys herself, but I think Robert is the asshole for not going and having my guest wait outside for over 1.5 hours.

tl;dr: Friend’s guest took common spare keys away, locking my guest outside. Flatmates say I’m an asshole for expecting friend’s guest to go home open the door.

asking my housemate's guest to bring the spare keys back home after he locked my guest outside