Moonlight! Starlight! The Bogies will be out tonight! Give us a candle - give us a light! If you don't you'll get a fright. It's Punkie Night tonight! Time to meet - for a trick or treat! It's Punkie Night tonight! Punkie Night, Punkie Night, Punkie Night, tonight!" All of Mildred's attempts to revise her potion notes fail, and when Miss Hardbroom gives them the test of making a laughter potion, Mildred and Maud create one that's a slimy green colour - Ethel Hallow (who never worries about tests) makes one that's bright pink. Fearing the worst, they swallow the potion and wait for the results to set in. Soon, everyone's giggling as the potions do their work, except for Mildred and Maud - who discover they are invisible. Miss Hardbroom sends them to Miss Cackle's office, where Mildred is severely reprimanded, and called the Worst Witch. Mildred is determined not to get into any more trouble, but Halloween is near, and Mildred's class is chosen to put on a flying display. In a rare .