If your friend will have his/her birthday soon, make him/her a dizzling surprise! At first he/she will be shocked, but later amused and astonished!
However, this joke can be performed if you have policemen friends or will contrive to convince usual policemen into taking part in the joke...
So, imagine the picture. Your friend, who has his/her birthday, is walking in the street, thinking about the evening party or something of that ilk... And here, a police car suddenly stops, the policemen go out, seize the honoured person and without saying a word pull him/her into the car, having put on handcuffs before it... You friend will be scared and understanding nothing. No doubt, policemen should keep silent and answer no questions...
As you already guessed, in fact the policemen will get the honoured man to the appointed place, where the celebration of the holiday was planned.
I am sure, the honoured man will be devilishly happy to see eventually all his friends, smiling a happy