So, to follow up on my last post, it seems my understanding of the odd, question-mark shaped stuffie was flawed.
Turns out, as my six-year-old explained to me, because apparently it sometimes happens that I need things explained to me by a six-year-old, that what it is actually for is this:
Mom is on the phone. Young child has a query. But, alas, mom is still on the phone, and mom has told child numerous times that unless they are broken, bleeding or on fire, that they have to wait until mom is off the phone. Instead of tugging sleeves, and repeatedly going 'mom! mom! mommy! mom!' and so forth, child simply hangs the question mark on mom's arm as a way to indicate "Hey Ma! I gots something to ask when you're done flapping your gums!" When mom is done on the phone, she has this bizarre thing on her arm to remind her "Right. Better see what the kid wanted."
SO in that light, it's probably more practical than I may have believed it to be.