Bear in mind this is totally theoretical—I've never had a crush and I don't want one—but I would just tell them straight up that I liked them, that it's okay if they don't like me back, but I thought they should know. It might make things a bit awkward if we were already friends, but not telling them would make it even worse.
And then if they liked me back I would use this card
because I've always wanted to.
What's your favourite piece of geeky merchandise?