Here's an important dating tip: If a guy ever whispers, "Can I keep you?" while you're finishing dessert, just run.
See also: 6 Halloween Movies Seen in the Harsh Light of Adulthood
Casper might have seemed adorable when you watched him as a kid. But compare his behavior to a few awkward first dates and he starts to come off as the overly-friendly ghost.
A girl isn't just in his bed -- she's in his room, taking up drawer space, leaving her toothbrush by the sink. It's just too soon for that kind of intimacy, and Casper gets a little too excited for someone he just met.
"I'm a kind, gentle, caring ghost. I'll tell you more after I unwind my body from around your mouth."
A Sleeping Beauty-style kiss from a significant other is cute. Kissing a sleeping person who definitely, pointedly sees you as just a friend is awkward.
Suddenly, Edward saying, "I feel very protective of you," in Twilight seems stand-offish in comparison to this awkward line. Whispering it doesn't help -- especially when she's sleeping!
This effect can also be achieved by muttering under your breath. For example mumbling, "So, would you want to, like, check out my really cool taxidermy display? Or possibly marry me?"
It might be his ability to defy gravity and make you levitate, but there is something off-putting in his delivery that's making your skin crawl -- and it's not the fact that he doesn't have any, either.
Nice to meet you! Want to see some turn-of-the-century electronics my dead dad made? No? Ok, sit in this moving chair and I'll show you anyway!
But not necessarily when you want him to.
Image: Universal Studios