The beginning of Vayetze describes Yaakov's going to sleep with a stone or stones at his head. I've heard that a midrash says that various stones argued over which of them would be under his head, and that God merged them into one stone that could be under Yaakov's head. I can think of three scenarios; which occurred?
- Yaakov put them all at his head and went to sleep. They got merged afterward.
- Yaakov put them all down for his head, including one that his head would actually rest on. They argued over which should be under his head, and got merged. Then he went to bed.
- Yaakov went looking for a stone to put his head on. A bunch of stones wanted to be chosen, argued, and got merged, and Yaakov chose the resulting stone.