A son was arguing with his dad, insisting that 1+1 equals 11

The father then looked at his son's eyes and said:

-Right, then go and buy 2 popsicles!

His son then goes and buys 2 popsicles.

Then, his dad said:

-Now give me one and the other to your brother!

Son asks:

-What about mine?

Father answers:

-You can have the other nine left over, stubborn kid!