Beloit police are investigating an attempted robbery of a popular east side eatery. Police say a man in a red Jeep passed a threatening note through the drive-thru window at the Culver’s on Cranston Road about 7:45 p.m. Wednesday. Officers say the wait staff simply closed and locked the drive-thru window. The would-be robber drove away. Police say the description matches the suspect in several similar cases at Culver’s in the area including Janesville.