Old TVs
Televisions were thick, dark, fuzzy, and operated with an antenna. Sometimes you just wouldn't be able to find a signal, or it would be weak enough to barely see and hear the shows. This is a piece of boomer culture that definitely deserves to stay in the dark ages...
Spanking Behinds
Though extremely rare today, spanking used to be incredibly common. If you had a misbehaving child, a quick slap on the bum would be enough to teach them a lesson. Today, this action would raise some eyebrows, but it used to be the case that this was just normal parenting stuff.