Police are looking for the man seen in the surveillance video from Saturday night.
Authorities say the robber pulled up to the West Haven drive-though window and asked for change for a $100 bill.
When the worker refused, the man announced it was a robbery and tried to climb through the window.
The worker first tried to shut the window on him, before tossing a cup of hot coffee in his face.
When that didn't stop him, the clerk grabbed a whole pot of coffee and threw it at him.
The man got away empty handed.