na Lovegood's popping eyes appeared over the top of her upside-down magazine again, watching what Neville was doing. Neville held the Mimbulus mimbletonia up to his eyes, his tongue between his teeth, chose his spot, and gave the plant a sharp prod with the tip of his quill.

Liquid squirted from every boil on the plant; thick, stinking, dark green jets of it. They hit the ceiling, the windows, and spattered Luna Lovegood's magazine; Ginny, who had flung her arms up in front of her face just in time, merely looked as though she was wearing a slimy green hat, but Harry, whose hands had been busy preventing Trevor's escape, received a faceful. It smelled like rancid manure.

Neville, whose face and torso were also drenched, shook his head to get the worst out of his eyes.

‘Sosorry,’ he gasped. ‘I haven't tried that before.... Didn't realise it would be quite so... Don't worry, though, Stinksap's not poisonous,’ he added nervously, as Harry spat a mouthful on to the floor.

At that precise moment the door of their compartment slid open.

‘Oh ... hello, Harry,’ said a nervous voice. ‘Um ... bad time?’

Harry wiped the lenses of his glasses with his Trevor-free hand. A very pretty girl with long, shiny black hair was standing in the doorway smiling at him: Cho Chang, the Seeker on the Ravenclaw Quidditch team.

Rather pink in the face, she closed the door and departed. Harry slumped back in his seat and groaned. He would have liked Cho to discover him sitting with a group of very cool people laughing their heads off at a joke he had just told; he would not have chosen to be sitting with Neville and Loony Lovegood, clutching a toad and dripping in Stinksap.

‘Never mind,’ said Ginny bracingly. ‘Look, we can easily get rid of all this.’ She pulled out her wand. ‘Scourgify!’

The Stinksap vanished.

‘Sorry.’ said Neville again, in a small voice.

Ron and Hermione did not turn up for nearly an hour, by which time the food trolley had already gone by. Harry, Ginny, and Neville had finished 