Another Good Surprise Option:
Easter Coming Up? Bring your parents an easter basket as a gift to celebrate the holiday. Amidst the candies (I suggest Cadbury Bunny Eggs, the absolute best indulgence on earth) place a few plastic eggs with hidden messages inside instead of candy... Write messages for each one - "Nope, not this one!" "Try Again" "Almost there"... and finally "We're Pregnant!"