The classic. Your friend touches the screen, and it immediately "shatters" with a loud crack sound.
Some older "Touch On Girl" APKS simulate "scanning" or "seeing through" clothes. These are often age-restricted and may be blocked for minors on the Google Play Store Touch On Girl Prank Simulator Short Description: A funny "scanner" simulator to trick your friends. Long Description:
These apps have built-in safety reviews from Google, making them a safer bet, though they may have ads.