You will experience a temporary mental block.
Many people develop a stammer in speech as if the tongue is tied.
Your heart will beat faster at their sight.
You will want to be with them always.
Joy wells up in your heart.
You feel contented.
A constant smile appears on your face.
You will dream about them.
Jealousy and possessiveness set in.
You actually get confused, especially girls. Lol:)
Do I need to say more?