Design a vibrant Halloween t-shirt featuring a cartoonish pumpkin with a mischievous grin, surrounded by playful ghosts that appear to be floating around it. The pumpkin is rendered in bright orange with exaggerated features, while the ghosts are depicted in soft pastel shades of white and light blue, giving them a whimsical look. Above the pumpkin, the phrase "Happy Halloween" is written in a bold, vintage font, colored in a striking black that contrasts beautifully against the t-shirt fabric. The background remains minimal, allowing the main elements to stand out, creating a festive yet spooky atmosphere that captures the essence of Halloween.