74. Let's just say that it isn't a great idea to cook and eat an Axe Beak if one of the party members seems to be missing and you're in a region where that particular animal is very uncommon.
I've haven't walked out on a DM yet (hopefully I'll never need to), nor have I had anyone walk out on my games. Our current group is quite a good bunch for getting along.
In an old group, we collectively stopped playing in a game once and told the DM that if he couldn't do his role properly then someone else will have to take over.
I have had to kick a player out once for using feats he shouldn't have had and refused to change them to something more suitable; we started the campaign with characters being made from the core rules and one supplement book, but he decided to use a set of completely different books that we weren't playing from.
A handy thing for a DM do when running a game is to print out a brief list/table of the player's base stats and feats & traits with notes on what they do so they can glance at them for reminders.
Not a one liner, but...
In an adventure with an old group, I played a blind Gnome sorcerer who had minor clairvoyance to sense obstacles within a 4ft radius.
Ranger rolls a 1, followed by a 19.
GM - "The sounds of nature fall silent as you raise your sword from the entangled undergrowth, you glance down at your sword and notice the crimson red now running off the tip of the blade." (something around those lines)
Everyone suddenly went a little sheepish and looks at each other and then at me.
Ranger - "Oh God, oh God... please don't let that be the Gnome... I'm so sorry!"
Everyone looks at me patiently as I read a second note handed by the GM.
Me - "Thanks for waiting guys; say, has anyone seen my familiar?"
The look of relief on the group's faces was priceless.
My favourite one liner in an adventure would have to be from our GM where one of the player's character was a master of the elements who had to pray to his Goddess to use his power.
Player - "I call upon you my Goddess, grant me your powers over the elements: Earth, Fire Wind and Water!"
GM - "Heart!" [short pause] "With your powers combined, I am Captain Planet!"
The whole group struggled to keep a straight face whenever he went to use his spells for the rest of the day after that.
They've put up an update on their current KickStarter page to let us all know the new and improved one is on the way to being launched.