Graceful Exit???

It's awkward to wake up next to someone you met last night, but how do you leave gracefully from something so ungraceful.

-I mean what if one party involved catches feelings, and wants to pursue it? oh this was fun, but i'm cool. That is liable to get someone slapped male or female.
-What if you had beer goggles on, and they are butt crack ugly? Oh God, how much did I drink last night? That is not only rude and hurtful, but very much slap worthy.
But none the less whatever the situation may be, it's difficult to just be like I gotta dip, with out coming off as a rude, insensitive jerk. But here's a few things that have worked for me, where I didn't come off as a horrible person.
-I had an amazing time with you, but i gotta run. Class in a little while. before they realize its Sunday you are out the door and in a cab home.
-I have an early meeting so I can't stay the night. Easy and simple, nobody questions it and you are good to go.
-I had fun, maybe in another life we could have been more, but if its fate, we will meet again. Mother earthy, and before they figure out that you are blowing them off, you're dressed and gone.
At any rate, use something that works for you, and not something outlandish, because it brings up to many questions, and puts you in a situation where you can get slapped or stalked as per my previous entry about one-night stands.