These are some tricky questions...
What's the name of this potion?
This potion has the colour of molten gold, and while exposed to the air, large drops will leap like goldfish above the surface without spilling.
This is the Mary Sue potion, Felix Felicis featured in Half-Blood Prince. I had a hard time trying to keep my eyes from rolling at this, it's not unlike the Time Turner featured in the third book. Just a cop-out that I'd personally never use in my stories.
Which book is this line from?
"Harry and Cho were now too embarrassed to look at each other, let alone talk to each other; what if Ron and Hermione started going out together, then split up? Could their friendship survive it? Harry remembered the few weeks when they had not been talking to each other in third year; he had not enjoyed trying to bridge the distance between them. And then, what if they didn't split up? What if they became like Bill and Fleur, and it became excrutiatingly embarrassing to be in their presence, so that he was shut out for good?"
This is from the Half-Blood Prince. The Bill and Fleur remark gives it away, really.
Who utters these words?
"Oh I am glad I'm not on duty. I wouldn't fancy having to go and tell the Irish they've got to stop celebrating."
Ohhh, I just listened to this while on my walk with Daisy the other day. It's from Goblet Of Fire and it's Arthur Weasley. I don't know who was worse then, the Irish or the Bulgarians. ;)