Knee touching

If you're sitting next to the guy/girl you like, put ur knee against theirs and see what they do. if they take their knee away, maybe they didn't notice it and try once more. if they take it away again, they might not be interested or ready. But if they don't take their knee away, gently push your knee against theirs. If they respond with pushing their knee, they are obviously interested :P GOOD LUCK!