to make one's fingers V-shaped and put them behind a person's head as a way of joking, particularly when taking a photograph

頭の後ろでピースする, 後ろから耳みたいにVサインする
to grab and pull a person's underwear or pants to make it get stuck between their buttocks, often as a prank

いたずらで下着を引っぱり上げる, 下着を引っぱるいたずらをする
in an ironic, humorous, or insincere way, not meant to be taken literally

冗談半分で, 皮肉を込めて
to behave in a silly way, particularly to amuse or entertain others

ふざけて笑わせる, 道化役をする
to joke with someone in a friendly manner by trying to make them believe something that is not true

冗談でからかう, 冗談でだます
to joke with someone in a friendly manner by trying to make them believe something that is not true

からかう, 冗談でだます
to make someone see, think, or believe something that may not be true
said humorously when a light is switched on, referring a Bible story about how God lighted the earth for the first time

はい、明かりがつきました, 明るくなった
