Write the beginning of a funny story based on the following. 

NAME_1 (age 12). his brother NAME_2 (age 8), and their dad are driving through the country when they spot a roadside dunk tank. The boys are both excited. They ask their dad if they can stop and dunk him. Their dad says he'll do it, but not if he's the only one going in. He'll only stop if they both promise to take a turn in the dunk tank too. NAME_2 is brave and eagerly agrees. NAME_1 is timid. He is hesitant, but doesn't want to miss out on the fun, so he agrees too.

The dunk tank is unattended and free of charge. It appears to be filled with slightly dirty water. Next to the dunk tank is a bucket of balls and a sign. The sign says, "Dunk tank. Use at your own risk. Bathing suits recommended." Despite the sign, there's no real risk that someone who goes into the dunk tank will get sick or injured.

This section of the story should include the dialogue NAME_3 NAME_2, and their dad have in the car and end with them pulling over by the dunk tank.