If your joke is funny you will not experience surprise if someone does what? - scare - send flowers - laugh - cries - keep secret  The best answer is
laugh

Lara checked out the loose hub.   He she didn't tighten it, the what might come loose and then hundred of people would die? - propeller - electric fan - datahub - car wheel - gasoline  The best answer is
propeller

Birds do what by laying eggs? - air - pick berries - sky - breathe - reproduce  The best answer is
reproduce