He came up with a loony plan to sail across the ocean in a bathtub.

People in the town called him a loony after they found his collection of strange inventions, but he was just a harmless tinkerer.

Her looniness made everyone at the meeting exchange nervous glances.

She dropped a loonie into the donation box at the grocery store.

She dropped a handful of loonies onto the counter and smiled at the cashier.

The cartoonist celebrated the city's different looninesses with a new gallery of eccentric portraits.

Don't invite that loony tune to the book club; he'll derail every discussion with his wild theories.

That loony tunes theory he proposed at the meeting surprised everyone.

The old radio was full of loony tunes that made everyone in the house dance and laugh.

The loony toons barged into the café and transformed a quiet afternoon into a chaotic comedy hour.