And she walked to Wilfred, kickedhim out of his chair and caught his feet in her hands.
‘Say this after me!’ she screamed, ’Seven three are twenty-one! Seven three are twenty-one!’
Just then, Nigel jumped up and and pointed at the blackboard ‘The chalk!’ he shouted. ‘Look at the chalk! It’s moving – and nobody is holding it!’
Everybody looked at the blackboard. And it was true! A piece of chalk was moving across it.