I have a cool ringtone for each of my contacts (Yep its a hassle for everyone i put in but its worth it when i want to know who's calling) When it's my dad it goes like someone knocking a door and then screaming "OPEN UP THIS IS THE POLICE" and some sirens start ringing hehe
My phone's always on vibrate so that it doesn't get confiscated in class, and if it wasn't on vibrate, I wouldn't hear it ring because I'm always listening to my iPod.
But, nonetheless, I do have a set ringtone. Hellomoto does it for me. XD