Folding Face Up

I think it is a really bad mistake to do this when making a big laydown. Maybe people want to show how smart they are or induce the winner to show.

I like to fold face up when it doesn't give any information, like folding in the BB to a raise no one called.

I like to show one card when it doesn't tell much. For example showing a K when someone folds to a 3! or a 3! and a cbet, so I probably have KK or AK, but they can't tell which. Or show an Ac when they fold on a 3c board.