One of the odder inclusions in the Batbelt is the Glue Globules, used in Arkham Origins and the Public Enemeis movie by Batman.
It's as straight forward as it sounds. Find an enemy, throw this grenade, it explodes glue out of everywhere, and the enemy is stuck.
While Batman has more practical gadgets in his belt. You have to admit it's a creative tool, and unlike Bolas which just tie them up, the glue would ensure they stay where they are for a good while.