A simple sketch I wrote up for the Arduino Uno. Every click of the switch will increment a hit counter and output it to the LCD.

Simple Hit Counter on Arduino Uno - Before Clicking Simple Hit Counter on Arduino Uno - After Clicking

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// set up a constant for the tilt switchPin
const int switchPin = 6;

int hits = 0;

// variable to hold the value of the switchPin
int switchState = 0;

// variable to hold previous value of the switchpin
int prevSwitchState = 0;

void setup() {  
  // set up the number of columns and rows on the LCD 
  lcd.begin(16, 2);

  // set up the switch pin as an input
  pinMode(switchPin,INPUT);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Hit the button");
  lcd.setCursor(0, 1);
  lcd.print("to increment");
}

void loop() {  
  // check the status of the switch
  switchState = digitalRead(switchPin);

  // compare the switchState to its previous state
  if (switchState != prevSwitchState) {
    if (switchState == LOW) {
      hits = hits + 1;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Hits:");
      lcd.setCursor(0, 1);
      lcd.print(hits);
    }
  }
  // save the current switch state as the last state 
  prevSwitchState = switchState;
}