Jim Ryan, to whom these puns always seem to happen, sends this.

Where we lived in Brookline, a small town of just a couple hundred persons about 15 miles west of Nashua, just before you came into the village itself, coming from the Nashua side, the road made a quite sharp turn. Just beyond the turn was the garage where the town’s police car was kept. There was apparent concern that when the police car zoomed from the garage that someone rounding that bend might collide with it. So, to give fair warning the town erected what they thought was self-explanatory sign, “Lookout for Flashing Policemen”.

Yet another true story! And “Lookout” was how the sign was lettered!