a piss in the Mississippi - so little it's like putting a pebble in the ocean and still

so little it's like putting a pebble in the ocean and still saying you're the king of the waves.

He gave a dollar to a rich guy who had a million. That’s a piss in the Mississippi.

She used a single drop of ink in a whole book. It was a piss in the Mississippi.

He took one bite out of a whole pizza. That was a piss in the Mississippi.