" Lockwood stepped aside, his boots crunching across the salt, to stand and study the paper beneath the light. No such luck with George; he came in close, his eyes bulging so much behind his spectacles, they almost pressed against the glass.
'I can't *believe* you did that, Lucy. You're crazy! *Purposefully* freeing a ghost!'
'It was an experiment,' I said. 'Why are you complaining? You're always messing about with that stupid jar of yours.'
'There's no comparison. I keep that ghost *in* in the jar. Anyway, it's scientific research. I do it under carefully controlled conditions.'
'Carefully controlled? I found it in the bathtub the other day!'
'That's right. I was testing the ghost's reaction to heat.'
'And to bubble bath? There were bubbles all over the jar. You put some nice soapy fragrance in that water, and...' I stared at him. 'Do you get in the tub with it, George?'
His face flushed. 'No, I do not. Not as a rule. I - I was saving time. I was just getting in myself when it occurred to me I could do a useful experiment about the resistance of ectoplasm to warmth. I wanted to see if it would contract...' He waved his hands wildly in the air. 'Wait! Why am I explaining myself to *you*? You just unleashed a ghost in our house! "

― Jonathan Stroud , The Screaming Staircase (Lockwood & Co., #1)