The Erased Announcement
Torah learning
Rav Chezkiyahu Navnatzel shlita was once asked to give a shiur in the Ramban shul. The gabbaim hung a notice in the shul announcing the time of the shiur and wrote elaborate praises of him on it. After a few days they noticed that the descriptions they had written had been erased.
They investigated who would dare to insult his honor, and it became clear that it was Rav Avraham himself who had erased what they had written.