.....Placemats.
They only show up when there's food on the table.

.....Mascara.
They usually run at the first sign of emotion.

.....Bike helmets.
Handy in an emergency, but otherwise they just look silly.

.....Government bonds.
They take so long to mature.

.....Copiers.
You need them for reproduction, but that's about it.

.....Lava lamps.
Fun to look at, but not all that bright.

.....Bank accounts.
Without a lot of money, they don't generate much interest.

.....High heels.
They're easy to walk on once you get the hang of it.

.....Curling irons.
They're always hot, and they're always in your hair.

.....Mini skirts.
If you're not careful, they'll creep up your legs.

.....Handguns.
Keep one around long enough, and you're going to want to shoot it.