Memory Game Safety SignsOnline version This will help you practice safety signs. by Julianne Linza Hazardous, toxic materials like blood are in here. Do not pick this up! Watch where you are walking. It could electrocute or shock you. People are keeping this community safe. Keep matches, lighters, and cigarettes away! Firefighters and EMTs work here. This is a place where young adults who are in trouble could go.