I watched my own hands lift the overflowing kettle, spilling a little water in the process.
I couldn't see my hands, but I knew I was holding the nearly empty kettle with a firm grip as I walked it across the room. 
mnli hypothesis: I couldn't see my hands, but I knew I was holding the nearly empty kettle with a firm grip as I walked it across the room.  premise: I watched my own hands lift the overflowing kettle, spilling a little water in the process.