Suitable extract for mini performance.help

[rowanbrookt at yahoo.com]

No: HPFGUIDX 30631

Please help. I am looking for a largish section of harry/hermione/ron 
dialogue to do a small performance. I want it to be funny and of a 
suitable length to be worth doing. I only want to use those 3 
characters if at all possible and i do not mind which book the scene 
is taken from. Any suggestions because I AM STUMPED. Whats your 
favourite harry/hermione/ron banter?