U is for Underpants
If you could spend a random 24 hours observing our household, you would see that my kids spend a lot of time running around in only their underpants. It can be really tough to get them to keep clothes on. Any excuse and they will shed their clothes and run gleefully from room to room.
Sometimes they are emulating a favorite book character, Captain Underpants, and they add capes and soar around the house.
Other times they stuff most of their underwear into their butt cracks (I kid you not) and pretend they are sumo wrestlers.
I assume they are going to grow out of this one day, but I am going to miss it!