Hazmat examples

certian dry chemicals become toxic or explosive when water is added...
changes the chemical balance....into a new dangerous item

 

Class 4.3 (the class number is located at the bottom of each placard) Goods are dangerous when wet. These items can admit flamable gas or react violently when mixed with water.

Sodium
Calcium
Potassium
Calcium Carbide

Anyhow, Hazmat is a large subject and hard to just type out. Here is a link that will help.
http://en.wikipedia.org/wiki/Dangerous_goods

 

It's a line of swimwear.. http://dangerouswhenwetswimwear.com/

For real though, this link may explain it better. It's from the MSDS Hyper Glossary.
http://www.ilpi.com/msds/ref/waterreactive.html

also cats are dangerous when wet, especially if you're trying to bathe it and it hasn't been declawed.

 

Don't forget that group of truck drivers who don't like water and refuse to bathe or use water to clean their cloths. they may react violently when that outer layer of funk is washed away.

 

women.......