In our previous flat (and before Harvey came into our lives), I saw a mouse run across our living room floor late one night. Being without any made-for-purpose traps, and with shops being shut, I created a make-shift effort by propping a tupperware tub against the bookshelf it was hiding behind, with a square of tost in the far corner, and running a piece of string with a knot a the end from the tub to the settee where I was sitting. Ten minutes of sitting absolutely still saw the wee beastie poke its nose out, but still I waited. A short while later it ran all the way out, and I pulled the string, trapping it under the tub.
At that point, I realised that I had a mouse trapped under a tupperware tub, and no idea what to do with it. I decided that our baking sheet would slide under the tub, but not knowing how strong the wee bugger was, I left our iron on top of the tub while I left the room. Happily it was still there when I returned, and I was able to slide the tray underneath and transport the lot to our balcony, where I introduced our little visitor to the concept of gravity.