In casual texts, the phrase on one's Ls is sometimes used as an alternative form of on one's L's.

When attending the ambassador's reception, one must be on one's Ps.

After mixing the ingredients and baking for 20 minutes, there one has it — a perfect apple pie.

I have to admit, good one!

When the villagers whispered about the oul one who lived by the crossroads, children dared each other to ring his bell.

Every summer the oul' one sits on the porch telling stories to the neighborhood children.

When traveling in the Outback, one might find oneself on one's pat, forced to fend for oneself.

The cold wind chilled one to one's bones.

By the end of the night, the cold had seeped to one's bone, leaving everyone shivering.

During the long voyage, the crew mended one anothers sails to withstand the storm.