Caring, being a good listener. Being sweet, kind, and complimentary.
Teasing him enough to turn him on upstairs, but not too much to where he thinks with his ..
Follow these steps and you'll be like me in a committed relationship w/ the friend-zone
I stand/sit next to them to start with, there can't be anybody else who's closer to them physically....then lots of eye contact, start talking about things, laugh, but make it all funny and lighthearted, no serious conversations, just casual things, and start getting closer to them, maybe make some kind of comment about their hair or clothes as an excuse to lightly brush it, if they respond well then touch it again with another similar remark (I don't just reach out and touch people, it has to be in context), then if we're standing up I ask them if they want to go sit down somewhere, at which point I start talking more, brush more against them, compliment them, maybe put my arm around and if they're okay with that move it closer to them, maybe touch his thigh a bit.
If at that point he hasn't budged and is following me then I know I got that D for the night.
There aren't any tricks or one liners that actually work. Just be yourself, feel confident (which takes a while to build up for some, I know) and don't give a **** about the possibility of being rejected. Act like it would be a privilege for this person to date you if that helps.