Don't say Beetlejuice three times.
.Dreaming of Wonderland : Living in reality.
"'I shudder to think what the state of my in-tray would be if I was away from work for five days.'
'Yeah, someone might slip dragon dung in it again, eh, Perce?' said Fred.
'That was a sample of fertiliser from Norway!' said Percy, going very red in the face. 'It was nothing personal!'
'It was,' Fred whispered to Harry, as they got up from the table. 'We sent it.'"