If you like words games, I have a ton! Well, like 4 or 5..
- Trying to say words backwards (at first it's easier to read backwards all of the words you see)
- Trying to write/say little stories, each time with less words (first 20, then 18, then 15, etc)
- If you have flights of stairs, trying to make up a story with the exact same amount of words as the steps
- Assign each word of the story to each step, so you can say it backwards!
-Rearranging letters in a word to see how many words you can build with it
-Finding a weird word of your language everyday and trying to use it at all times
-There's also a game (don't know if there's an app for it) in which you're given a word forming a circle and you have to see where the word starts and where it ends
- There's another app that gives you images and you have to find the word that is common to all photos
-I also like messing up with people swapping objects and their names (like saying "banana" for "apple", and "apple" for "orange" and "orange" for "strawberry", etc). It lasts until you call something by its real name
- If you have people you want to mess up with, you can also invent weird words for normal objects and say the new word every time you see said person, and then count how many days pass before the person begins to call it the weird way (by accident or on purpose), and laugh when they say it to the public who doesn't know about the word (yes, I'm evil

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