It's not uncommon for a mom or perhaps a bridesmaid, even an officiant to pull me aside before the ceremony or first look begins and say, "Now make sure you get his reaction, I just know he is going to lose it!" I, of course, assure them I will do my best and that the moment is just going to be perfect.
While this sentiment is meant as excitement for the couple, and nerves just make people say things because they've heard others say them; I've found in practice that it sets up both the couple and those who love them for failure or disappointment.
If you expect your love to cry and they don't, or drop to their knees and they don't, or do a happy dance and they don't, it immediately makes you wonder if maybe you're not dazzling enough. Maybe he doesn't like the dress you chose, or she thinks your hair looks funny. Maybe they're just ready to get this part over with so they can get to the party. Maybe they're getting cold feet. In reality, maybe your love is just not a crier. Maybe instead you've rendered them speechless and all they can do is take you in.
Might I suggest instead to have no expectations, only love.
Rather than worrying about how they're going to respond to you, focus instead on taking them in, fully. Notice the way her curls fall across her face (her stylist put in a lot of work to make that happen you know), notice that he put on your favorite cologne and breath in deeply, notice the shy look on her face as she twirls (she's a little nervous you won't like her dress), notice how he fidgets with his watch and sways back and forth (he's a nervous too, this feels like a first date after all).
When you commit to just living fully in the moment and allowing your love and your family and friends do the same, I promise the day will be more fulfilling, more surprising, more memorable. You be you and let them be them.
Live in the present and let me capture the memories.
Annnnnnnnd the same theory applies to the proposal of course...
And one more...can't resist. :)