Problem: Continue the following story.

The chemical that the scientist used was more dangerous than the other liquid, because the 
Here's how I want to continue it: liquid was weak.

Problem: Continue the following story.

The dentist was happy with Derrick's teeth but not Joel's. 
Here's how I want to continue it: Joel had a big buildup of plaque.

Problem: Continue the following story.

Investing in a business better suited Brett but not Kevin because 
Here's how I want to continue it:
Brett always did their taxes.