April Fool's Trick from Martha Stewart
April 1 offers the chance to summon your inner prankster and catch family off guard.
Transform milk into an unpourable mass:
Stir
1 packet of powdered gelatin into 2 tablespoons of water, and let stand
for 5 minutes. Warm 2 cups of milk in the microwave. Stir the gelatin
mixture into the milk. Transfer to a glass pitcher or bottle, and
refrigerate until set, about 2 hours.