Would you like a balloon?

There's a house on the road that I take to work everyday. Well the driveway to a house. Once a week, fresh mylar balloons appear tied to a stick next to the driveway of this house. This past week heart shaped, Happy Valentine's day balloons. The week before was Elmo. The week before was a ladybug. They stay there until they deflate and a few days later fresh ones appear.

The stick is almost completely covered in frayed remains of ribbon.

This is obviously a long standing tradition.