Randomizing sounds (on keypress)?

hey everyone, im working on a game where you can "burp" by pressing the b key in game, i got a little bored with hearing the same sound over and over so i made another sound, and a script that let it have 2 sounds, but from here i have no idea how i could "randomize" the order of these sounds and also how i could add more sounds (below is my script)

 var canPlayAudio = true;
 var waitTime = 1.0;
 var whichBurp : boolean = true;
  
 var Burp1 : AudioClip;
 var Burp2 : AudioClip; //Drag your audio clip here in the Inspector.
  
 function Update () 
 {
 AudioController();
 }
  
  
 function AudioController()
 {
 if (Input.GetKeyDown ("b") && canPlayAudio && whichBurp)
     {
     canPlayAudio = false;
     audio.PlayOneShot(Burp1);
     yield WaitForSeconds(waitTime);
     whichBurp = false;
     canPlayAudio = true;
     }else
    if (Input.GetKeyDown ("b") && canPlayAudio && whichBurp == false)
     {
     canPlayAudio = false;
     audio.PlayOneShot(Burp2);
     yield WaitForSeconds(waitTime);
     whichBurp = true;
     canPlayAudio = true;
 }
 }

Also, on a different topic, how would i make a particle system for what appears to be a stream of "vomit"? Thank you guys alot, atmos :)