Prompters of attention

Words that are used to get someone's attention or direct the listener's attention to something.

• What words are used to get someone's attention?
  you you there hey you hello excuse me attention attention please may I have your attention please pay attention listen up everybody now hear this and now for an important announcement and now for a word from our sponsor just a moment wait a minute lend me your ears look here ahem
• What words are used to direct someone's attention to something?
  behold look will you look at that get a load of this
• What words are used to warn someone of danger?
  watch out look out heads up hit the dirt get out of the way here it comes oh no
• What non-verbal means are used to get someone's attention
  clear throat whistle raise hand