"When I have a tough time keeping my train of thought, I know I'm in 
love.  Plus, I get a funny feeling in my stomach and a twinkly in my 
eye when I'm around her."

"When you realize you're comfortable being yourself around her and she's 
all you think about night and day."

"When your heart skips a beat every time you see that person.  you get 
a little pain in your heart-a good pain."

"It's definitely love when every time you're apart, you want to be 
together again and you feel empty without her."

"You know you're in love when you sacrifice yourself to see that person
happy."

"When I'm falling in love with a girl, she's all I think about.  I can't
wait to see her, and she's the only person I want to talk to."

"No matter how bad a day I'm having, whenever I see her, it makes me 
smile."

"It's a sure sign when you love that person more than you love yourself."