A woman listened to R. Meir's exposition of the law. She was threatened by her husband to be sent away unless she spat in the face of R. Meir. Hearing of it, R. Meir pretended that his eye was sore and asked her to spit seven times on it for a charm and he thus made peace between them.
When Rabbi Meir Let a Woman Spit in His Face to Save Her Marriage
Gaster, Exempla of the Rabbis No. 145