The guests might even conceal themselves from view, and then when the honoree enters the room, they leap from hiding and all shout, "Surprise!". For some surprise birthday parties, it is considered to be a good tactic to shock the honoree. Streamers, silly string, and balloons may be used for this purpose. Evidence of a party, such as decorations and balloons, are not made visible from the exterior of the home or party venue, so that the honoree will suspect nothing.
The guests might even conceal themselves from view and then when the honoree enters the room they leap from hiding and all shout "Surprise" For some surprise birthday parties it is considered to be a good tactic to shock the honoree Streamers silly string and balloons may be used for this purpose Evidence of a party such as decorations and balloons are not made visible from the exterior of the home or party venue so that the honoree will suspect nothing