Arduino Centipede Dropping Prank

1#include <Servo.h>
2int trigPin = 5;    // Trigger
3int echoPin =  3;    // Echo
4Servo myservo;
5long duration;
6 
7void setup() {
8  //Serial  Port begin
9  Serial.begin (9600);
10  pinMode(trigPin, OUTPUT);
11  pinMode(echoPin,  INPUT);
12  myservo.attach(20);
13  myservo.write(180);
14}
15 
16void loop()  {
17  digitalWrite(trigPin, LOW);
18  delayMicroseconds(5);
19  digitalWrite(trigPin,  HIGH);
20  delayMicroseconds(10);
21  digitalWrite(trigPin, LOW);
22 
23  duration  = pulseIn(echoPin, HIGH);
24  Serial.println(duration);
25
26  if ((duration  <= 2000) and (duration != 0)){
27    myservo.write(0);
28    delay(1000);
29    myservo.write(180);
30    delay(5000);
31  }
32  
33
34  
35
36}