How are fish and soap alike?

This is a bit of a trick question! Fish and soap are very different things. However, there are some *loose* connections we could make:

* Both can be found in water: Fish live in water, and soap is often used to clean in water.

* Both can be slippery: Fish are slippery due to their scales and slime, and soap can make surfaces slippery.

But these connections are very weak. The main point is that fish and soap are very different and have little in common.