The girls usually turn around to drink water from a bottle why is that. The lipstick comment makes sense. It’s hilarious they have no issue showing legs for days but 2cm of cleavage and all hell breaks out.

The drinking water one is related to sharing bottles usually between people, so every one gets in a habit of pouring it just apart from their lips... I can't fucking do it, so I never share drinks here haha.

Short skirt etc, maybe the idols are coerced into wearing outfits a little more revealing than they are comfortable with. But many Korean girls choose to wear crazy short skirts, but become self conscious when walking up stairs or sitting down and hold their skirt down with their hands or put their hand or handbag behind their ass when taking stairs.

Cakeboxes? It's just kinda space saving because usually its on a table with a heap of other things and you don't want to put the box on the ground because u will probably put the remainder of the cake back in. Often the cake is given in a restaurant or even bar for celebration so the floors are not exactly clean etc, and it also raises the cake to a higher level which is easier for blowing out candles or taking pics with a person and a cake. It just seems logic in everyway.