The mathematical genius strikes again! When your daughter turns 1 and you turn 20, your dad didn't just buy balloons—he transcended to a higher plane of dad joke mathematics. By arranging the "2" and "0" balloons as "20 - 1 = 19," he's essentially calculating the age difference between you and your child. It's like he discovered the fundamental theorem of generational subtraction and ascended to cosmic dad-hood. The bottom image perfectly captures his internal state: pure enlightenment, radiating with the power of mathematical punnery that only fathers possess. Somewhere, Isaac Newton is slow-clapping at this display of numerical wizardry.