Some good ones from classic dumb stuff
Why is it called a "building" when it is already built?
Are you telling the truth if you lie in bed?
Are there any unguided missiles?
Do hummingbirds hum because they don't know the words?
Is this bullshit or fertilizer?
Is it OK to use the AM radio after noon?
Why is it that when you're driving and looking for an address, you turn down the volume on the radio?
Keep adding !