You've found a substantial amount of money on the floor (based on a true story)

[Mummelmann]

I find money scattered around sometimes at work (I work in a bar). There's generally no way to tell who dropped it so I either take it myself or share it as a tip with the bartenders.
If I found 1100£ on the floor of a store, hmm, I think I might take it, depening on whether anyone saw me.