Practical Joke?

Someone handcuffed & gagged me to a chair
I believe I was drugged
I have no food & water
I'm in a room I don't recognize
I try & escape
It's no use
Someone comes into the room and yells HAPPY BIRTHDAY!!
A bunch of other people make their way into the room
They're all blowing into party favors and balloons are all around
I don't recognize any of them
It's not my birthday
One person says to another
That's not Tim
We have the wrong person
How could this be?