Spring has sprung and all's well with the world.
This is a phrase that I often quote but when I looked it up it appears to be a mash up of two rhymes

The spring is sprung, the grass is riz.
I wonder where the boidie is.
They say the boidie’s on the wing.
But that’s absoid. The wing is on the bird.

and
"The year's at the spring,
And day's at the morn;
Morning's at seven;
The hill-side's dew-pearl'd;
The lark's on the wing;
The snail's on the thorn;
God's in His heaven—
All's right with the world!”

Everyone I met today seemed to be more cheerful.