"I whispered to my sil "Poor Mrs. C, she is stuck talking to your mom. Your mom is going off about farmers." Sil's eyes got really big and she said "That's just great, Mr. C is a farmer.""
Did you start praying for the ground to open up and swallow you or your MIL whole? At least, that's what I did when my mom's friend started ranting about the firefighters in town...right to the fire marshal's face. No, she didn't know it at the time. Unfortunately, once it's been said, it's hard to put a spin on it. "Oh, no, she called the firefighters 'fat jerks' because, uh, she thinks they're really muscular. Yeah, that's it. You're not buying that, are you?"