I've often wondered - you know when there's someone you have some kind of tension with, and you both grab for the same thing, and your fingers brush, and it's like an electric shock... Well if you feel it, does it mean the other person does too?
Same for the other signs, like repeatedly brushing arms as you walk along together, knees touching under the table. If you keep bumping arms, is it because you're both drawn towards each other, or (assuming you have some sexual awareness of the other party), could it all be you, and the other person's just wondering if you're pissed?
Obviously hard to answer given you don't know what the other person is thinking, but have you ever then got together with someone, and they've mentioned the same thing; or, (god, how awful), have you ever found out that what you thought were significant touches... simply weren't to the other person?