Children crave privacy. Some younger than others, but Mrs. Snark has already seen it in her own teenage son, who rather vocally has requested a lock on his bedroom door.
Mr. Snark's nephew, JD, has taken matters into his own hands.
JD's Improvised Door Lock
His mom says that she managed to cut him off from the roll of duck tape just in the nick of time. Poor guy had to make due with clear tape.