Literal meaning (to hold on tightly):
* The toddler latched onto his mother's leg, refusing to let go.
* The climber latched onto the rock face, using every bit of strength to stay secure.
Figurative meaning (to become interested in or attached to something):
* The reporter latched onto the politician's controversial statement, using it as the basis for her story.
* After spending a few hours at the art museum, the children latched onto the Impressionist paintings.
* The new student latched onto the idea of joining the school's robotics club.
Emphasis on suddenness or unexpectedness:
* The dog latched onto the stranger's hand, barking ferociously.
* The audience latched onto the comedian's joke, roaring with laughter.
Remember that "latch onto" implies a sudden and strong connection, either physical or metaphorical.