Had another game that went like this:
Our group was getting together for our regular game. Our DM at the time was PCS'ing (that's moving to a new assignment at another base for you civilians), and most of his game books had already been packed up and shipped. Pretty much all he still had with him was PHB, DMG, MM and his folio of personal characters (his and his wife - also in the group).
He tells us to make some high level characters (I don't remember the exact level but it was something like 10th to 15th level - which for us was high level since we had never played a campaign past 10th with the group). I decide to make an Arcane Archer Kit (2E AD&D Half-Elf Kit). The main ability of the Kit was you could cast touch-range spells on to arrows and fire them for effect when they hit.
So, we start the game. We're told we're just be-bopping along through our own personal lives (none of us know eachother or are anywhere near eachother) when we are suddenly teleported against our wills to the chambers of a very high level wizard (the DM's PC). The Wizard introduces himself as "Sir", because what-else do you call a 50th level Wizard! He says that he brought us here because he's really busy with research but his wife (one of the players) is bored and bugging him for attention. His wife (player and character) is a high level Asassin (20+ I think). Our job (and we don't have a choice) is to accompany the Asassin on a "Tour of Monsters". So with a wave and a "have fun" we are forcibly teleported again and find ourselves in a wilderness area.
Well, we talk amongst ourselves a bit, introduce ourselves, and decide what to do. The Asassin apparently knows exactly where she wants to go and sets off. With no other choice we follow. Now at this point I'm thinking, is nobody actually going to roleplay at all. Everybody just seems to be going along with it. I mean, I'm a pretty high level bad ass where I come from. I don't take very kindly to being force teleported, babysitting, or being put in dangerous situations without having a choice, so I start thinking of a way to get out of this.
The DM starts randomly picking monsters out of the MM. After a couple of monsters (the first of which was a Shadow Dragon, I don't remember what the second one was), our DM picks the Tarrasque! First of all there is no way we are high enough level to fight this thing, and no-one has a wish (remember 2E AD&D). So we use a time proven tactic and run-away.
By this time I'm tired of this so I finally strike upon a plan. I enchant an arrow with Hold Person and fire it at the Asassin. The Asassin looks at me and says "what the hell are you doing?". So I say, "right now, I'm rolling to hit"

. Super Asassin then says, "whatever, I have Gloves of Missile Snaring". One caught arrow and a failed saving throw later the Asassin is held. I walk up to her, hold a knife to her throat, and yell to the sky at large, "Sir, get us out of here or your wife is toast!". Abracadabra, we're back at the Wizards chambers.
So after some discussion of compensation, and the other players looking at me like I'm nuts, we set off again on a more survivable tour. In the end it wasn't too bad, but DM railroading with in-game and outside-game nepotism kind of rubbed me the wrong way.