Back in the day, most people had full size umbrellas. When it looked like rain in the morning, they would take their umbrella in to work and hang it by the handle on the wall of their cubicle.
I would loosen the umbrella (partially open while holding upside down), put hole punch chad in the umbrella, and then re-close the umbrella and hang it back up.
If it was raining at the end of the day, you knew you got the victim by the hole punch chad at the door. :-D If it wasn't raining, you knew it was just a matter of time. :-D
With the compact umbrellas, it is harder to get access to sneak chads into them and hole punch chad is somewhat harder to come by.
I'd rather get punched in the face and get it over with than endure this.
There was a variation on keyloggers disguised as USB hubs used to sniff passwords and text, basically a man in the middle attack on keyboards. They're essentially read only devices which store what they sniff into internal memory or retransmit it using other means. They however could be reprogrammed not to spy but just to emit certain text appended or in place of what comes from the keyboard, possibly in a spectacular way like waiting for a sentence written by the victim, then sending N backspaces to delete it and swapping it with a new one. ...who you gonna call? :)