You live in an apartment complex, your neighbours apartment is nearly always unoccupied by it's resident, they usually just walk in with a few bags and leave before coming back a few days later and repeating the same process

You start to smell horrible things coming from the apartment and knock on the door in annoyance and curiosity, you don't realise until you've already knocked but there's a bad feeling in your gut. She opens the door

Eva: "Ah hello, can I help you?" I smile innocently