One of my most vivid memories of my long since deceased grandfather involved a pair of play handcuffs that my parents kept in their bedside table. Why they had handcuffs in their bedside table and what that funny looking, vibrating pink tube was I did not question at my tender age of 5 (and would still rather not question now).

Now of course play hand cuffs have that little switch which makes them never really locked. So, my "magic trick" was to handcuff my grandfather and then show him how to release the handcuffs without using the key.

Of course, I put them on his hands too tight, the switch did not work, and stupid me, I had never bothered to look for the key since the switch had always worked for me.

It wasn't until about 14 years later when I found myself in a similar situation (this time involving a similar vibrating pink tube) that I could truly appreciate why he got so angry when I told him I didn't have a key.