Mate the best one i ever had was i went to a school where my wife works along with a copper (i'm a coastguard) to give a talk on the emergency services. When the copper got up to do her talk the kids (who were all 4 and 5..reception age) starting asking questions about handcuffs and baddies.

Then one little girl put her hand up and asked the policewoman if it was bad to smoke. The policewoman said well its not very healthy and then the little girl said "oh..its just that my mum uses a special pipe with her friends to smoke with and she says its healthier than smoking cigarettes..its a really big pipe and it smells funny"

lol