V3890 Sgr flickering. This light curve in the R band was taken on Cerro Tololo with the 1.0 m telescope in 2004 July, with the left panel showing a close-up of one night and the right panel showing eleven nights. The times series on the one night shows ordinary flickering, with amplitudes of ~0.03 mag and time scales of tens of minutes. The right panel shows night-to-night changes of order 0.1 mag, superposed on a rising trend of 0.02 mag/day.