Place it at the moment of the goofy arrival, before any reaction line from the group. Follow it with the MLG air horn when you want the entrance to escalate, or leave it as the solo punch before cutting back to normal conversation.
About this sound
This is a short, roughly three-second car horn effect with a wobbly, cartoonish honk that sounds deliberately silly rather than like a real road horn. It feels playful and a little mocking, turning a normal greeting or arrival into a small joke and making even a simple entrance feel over-the-top and goofy.