wedge - A piece of material with a thick end that tapers to a thin edge, used to split, support, or secure things; also something that forces separation or division between people or groups.

The disagreement drove a wedge between the two longtime friends, and they really didn't enjoy spending time together anymore.
hiccup - An involuntary spasm of the diaphragm, resulting in a sudden, brief sound caused by a quick intake of air, often followed by a noticeable "hic" sound.

A girl in the class couldn't stop her hiccups, and the other kids in the class couldn't stop laughing.