It's the Transition and juniors who play the tricks.

Of course, the seniors must know what's going on, because they used to do the same themselves, but they just shut their eyes." "Oh," said Irene thoughtfully.

"And because a thing has always been must it always be?
Can't it ever be altered?
Are we _bound_ to do nothing but play tricks on the last night of March ?" "It ought to be altered.

I've a jolly good mind to go to Rachel and tell her my views about it.

She's been much nicer lately than she used to be.
Perhaps she'd listen.