Because we all have them.
True story learned over the weekend: Polly is a BM Mary's wedding coming up in about a month. Polly just learned that she has a health condition that may require surgery on her brain. The condition is treatable but the procedure will likely be soon and is scary. Polly told Mary there is a chance she will not be able to be in the wedding due to the surgery. Mary's response is "Ok, well send your BM dress to Fay so that she can take your place." Polly says she probably won't be friends with Mary anymore.