Watching people hug, then guessing from the type of hug the relationship and/or situation. Airports are good places for this. Bus stations, bus stops, cafes.
Eavesdropping on conversations. Delicious.
Cloud watching, naming them, renaming them as they morph.
Pouring cream into coffee just for the explosion of swirls.
Playing with smoke. Incense works great for writing words in the air.
Spacing out. Just kinda staring, middle-distance, not thinking much.
Sticking fingertips into melted candle wax.
Stopping lists short, then returning to them later. Or not.