Anagrams
Each year we do a "clues hunt" where there are little slips of paper hidden all around the house and each clue leads to the next clue, until finally the clues lead to the kids' Easter baskets.

This year I did an acrostic style clue, where they had to fill in the word/locations and certain letters were circled. Unscrambled, the letters formed the location of the Easter baskets. When the kids had found all the clues, they settled down to work on unscrambling the letters. They didn't get it right away so I fetched them some Scrabble tiles to work on it.

The answer was BLACK CAR. This happens to be unbeknownst to me, an anagram of CRACK LAB. So that was funny.