The Classic Duck
US$9.99
The easy choice. When you purchase this duck your chosen recipient will receive a generic unmarked package. Inside will be one tiny, lonely, plastic, randomly colored, and confusing duck with a card explaining to them that they've just been ducked.
If you've got the makings of a super-hero villian you can select the "personalized message" option and explain to them exactly why they've just been ducked, otherwise it will be anonymous. Think of the drama.
Disclaimer: Keep in mind you can't go crazy with the personalized messages here. Keep it short, fun, and only moderatly looney. If you give off stalker vibes or get too gross I'll just cancel your order and refund your money.