You can pour melted vanilla icecream on the center of their forehead so “white stuff” leaks down -

HERE’S A FUN PRANK TO PLAY ON YOUR FRIENDS! WHILE THEY ARE SLEEPING PUT YOUR PHONE NEXT TO THEIR EAR WITH MAX VOLUME ‘GOOD LOOKIN’ ON PAUSE AND PUT A SAUSAGE IN THEIR MOUTH THEN UNPAUSE THE SONG; THEY WILL NOW WAKE UP WITH A SAUSAGE IN THEIR MOUTH AND “HE’S BOUNCING OFF MY BOOTY CHEEKS” PLAYING VERY LOUDLY IN THEIR EARS