Release your inner-cannibal
We Americans will use any form of measurement other than the metric system. We’d rather measure distance with football fields than meters, speed in freedoms per Statues of Liberty than KPH, and food portion sizes in faces rather than any other more reasonable form of measurement (weight?).
This server was trying to explain how large the Huge Plate of Nachos was by saying it was the size of her face. Then she asked the restaurant guest how many “faces” he wanted. She realized how horrible that sounded almost immediately, but the table she was waiting on had a good laugh.