Good Riddles

Question: 4 people walk onto a bus, there are only babies on the bus what is on the bus

Question: You wait for it. It appears, cracks, stays for a moment, then disappears before your eyes.

Question: How high would you have to count before you use the letter 'A' in the spelling of a number?

Question: What flag has five circles in it?

Question: People pick me, and watch me until they give me power. Then they don't stare in my eyes. What am I?