4 of hearts... made me blush, nice one.

A little thing you could add to your trick: When you hold the cards out, don't show the backs, that way you can afford to make the 9 of diamonds a red backed card while all of the others are black backed. That way, you have 2 chances of having the right card. You would have to have a prediction written down in your pocket saying the 4 of hearts though. You could do this the other way round too with the 4 of hearts being the red backed card. To give yourself another way out, you could start the trick with the 5 cards in the box. Also begin with an extra king of diamonds hidden in the box. When you begin, just remove the regular five cards and leave the other king in the box. Then if they happened to choose the king, you could show that there was a king in the box. To cover for the ace of diamonds, you could write AD on your arm. Then when the trick begins, have your sleeve rolled down over it. If they picked the ace, show them your arm. For the 7 of clubs you could stick another 7 of clubs card to the roof before the person enters the room. The person will not think to look up when they enter the room, but if they pick the 7 of clubs, you can point it out to them!
By doing this, there is practically no way for this trick to go wrong!
Hope this helps!

king of diamonds..

hey nc one thats my card

ahahah.. thats my choice!!!