I can think of loads of examples for myself:
- Went for a night away and left the front door open (the neighbours came round and shut it for us);
- Went away for a week’s holiday and left a single ring of the gas hob on low (came back to a warm kitchen);
- When I was a teenager, left my bike outside the village shop and walked home (forgetting that I’d cycled to the shop);
- Left the keys to my bike in my bike lock at Cambridge station (came back the following day and both bike and keys were still there).
What about you?