lol...yup, just turn around and walk away.
I walked in on a female discussion of penis size once. One of the four “ladies” was so embarrassed she made it a point to never be around me again. Another one as much as asked my what I thought about it. I just got my coffee, wished them a good day and left.
Exceeded only by the time three of them were having a detailed discussion of their menstrual problems in front of some customers.
A couple of ladies at my work were having a similar discussion, but they were speaking Spanish so they thought it was private.
They didn’t realize our 19 year old good Catholic boy intern was fluent in Spanish until his face turned beet red!