When I was in eretz YISRAEL for the year I went for a bracha from Rav Shlomo Zalman Auerbach, zt’l.
A short while later I was at the kotel very late at night and wanted to catch the last bus back. I noticed what looked like hundreds, if not a thousand people davening at the kotel. I decided not to linger as I was afraid to get stuck.
That night I had a dream that a simple wooden chair was hovering above my head. I woke up and felt it was very ominous. I told my roommates about it, and discussed walking back to the kotel to Daven (as a group). Since no one wanted to go, I stayed back, said some tehillim myself and read (ironically, a story about rav Shlomo Zalman when he was a child). The next morning when I woke up, I heard the news that Rav Shlomo Zalman was niftar.
I felt that the chair represented din and that HKB’H was trying to wake people up to Daven.