Post-traumatic April Fool's

Wearing a red clown's nose bought from an April Fool vendor, and then, when prodded on the subject, saying, "Darn it, you got me!"

Saying, "Hey, everyone's walking on eggshells these days," and then when they look down, you've gone and sprinkled eggshells there.

Jail terms (though almost always suspended) for lying to produce a feeling of fleeting anxiety or disappointment followed by relief.