The unknown coin

When I pound it into my chest
It warms up my heart
There's no wonder it is mine,
But they don't shine
Which is fine.

They make a minefield in my heart
Boom, boom, boom
Now there is no room
But as soon I stepped on one
It doesn't start.

It makes a jingle with the others
Jingle, jingle, jingle
Now it starts to blingle.