If you watch some anime, chances are you gonna see that scene where the character doing something kind of out of the norm in public space and most likely a mother with her kid is passing by or stopping and then the mother proceeds to block the kid's view and saying "Don't look at that" or something like "Just ignore them / Let them be".
Anyone knows what this particular sscene is called and maybe any origin information. cause this gag seems quite used a lot but I don't really know if this kind of scene have any nickname or something like that.