On one of (countless) J41 trips, a sealing strip or mastic on the outside of the window I was next to gradually loosened and peeled off over the course of an hour. I told CC who alerted flight deck and on landing was thanked by CC for bringing it to their attention. Now it probably wasn't anything of concern but I didn't know that. The flight deck possibly even had a laugh at the SLF's ignorance.
At least to my face however they treated it seriously and that scores brownie points for me.