Place undisolved Jell-O in a bowl. Boil water. Place boiling water on Jell-O ,mix thoroughly but gently for at least three minutes. Once Jell-O is dissolved add rum. Place in 13x9 inch pan. Chill until firm (overnight). To cut out dip bottom of pan into warm water. Cut into squares. After a few of these you'll know your not in home-ec anymore!
Serve in a Favorite Glass