Prank apparatus with amusement effect

A prank apparatus, comprising:

• a base unit;
• a driving device mounted on the base unit;
• and
• a decorative unit mounted on the driving device;
• wherein the base unit includes a housing, a sounder mounted in the housing, a sensor mounted in the housing, a power supply mounted in the housing, and a control board mounted in the housing;
• the driving device includes a mounting seat mounted on the housing of the base unit, a drive wheel rotatably mounted in the mounting seat and having a periphery locally provided with a plurality of drive teeth, a drive motor mounted in the mounting seat and connected with the drive wheel to rotate the drive wheel, a driven wheel rotatably mounted on the mounting seat and having a periphery locally provided with a plurality of driven teeth meshing with the drive teeth of the drive wheel, a support bar connected with the driven wheel to move in concert with the driven wheel, and two torsion springs mounted on two opposite sides of the driven wheel and each having a first end connected with the mounting seat and a second end connected with the support bar;
• the base unit further includes a support rack mounted on the housing;
• the decorative unit is mounted on the support bar of the driving device and the support rack of the base unit;
• the decorative unit includes:
• an extension shank having a first end connected with the support bar of the driving device and a second end provided with an elongate guide slot;
• a movable in movably mounted in the guide slot of the extension shank;
• a first link having a first end pivotally connected with the movable pin;
• a decorative body connected with a second end of the first link;
• and
• a second link having a first end pivotally connected with the support rack of the base unit and a second end pivotally connected with the first link.