I remember my first flat – I was sitting at my PC, when I saw something out of the corner of my eye. Twas a mouse, staring at me before hiding behind the sofa.
I was surprised, because there had been no sign of mice (nothing chewed, no droppings). So I obtained a humane mouse trap, and because I am so humane, put in some hamster bedding and hamster treats (I had a hamster at the time – Raziel, the Angry).
Next morning, there was a mouse all curled up and snoozy. I released him out of the window, and reset the trap with the same little luxuries. Next day – another mouse. Same again – out of the window (I hasten to add I lived on the ground floor).
I repeated the process twice more, when I started to think, “You know, these mice all look mighty similar, even for mice”. So on the final time, I took him out to some corn fields. If he was to die, at least he would die free and provide a snack for local predators (or head to the nearby houses).
Despite resetting the trap, I never saw another mouse, and never saw any mousey signs. I either had a) a family of exactly five mice, one of which I cruelly separated from his kin, or b) one mouse, who knew a good thing when he saw it.