hate lock
A "supplementary" padlock that you irritably add to a staple already containing a padlock, to express your simmering resentment towards someone for preventing you from accessing whatever it is that he has secured with his own padlock; now he himself will not be able to easily access it, either.
Installing a hate lock is an effective but totally-harmless (i.e., it does not actually damage anything; the owner is merely delayed in proceeding until he finds some heavy-duty bolt-cutters) way to exact revenge on someone for locking up something. Extra points if you sarcastically use a pink heart-shaped "love lock" (especially appropriate for uncooperative exes) instead of just an everyday "generic" padlock to "doubly secure" the staple, or if you use a multi-hole lockout-hasp with six additional padlocks attached instead of just a single padlock, so that the original padlocker will have to really toil with da ol' angle-grinder for a lengthy period before gaining access himself. Plus if you're totally snortin'-mad and wish to really humiliate/distress him, you can even stake out the location and watch for him to arrive and begin cutting off the locks, and then you can make an anonymous 911 call so that the cops will come and investigate, since it would logically appear to others that he's trying to break in.
Get the hate lock mug.