The sign idea is smart if you could put it in a place that's very visible but can't be grabbed by the neighbor. Https://shipyourenemiesglitter.com/ is an option Maybe there are free newspaper/magazine subscriptions you could sign them up for to receive in the mail. Source: about 1 year ago

Others ship shit or a glitter bomb for them to open after they steal it! The shit senders are in the US but don't ship to Canada - there was a local one in Caledon, but they've stopped last year. Basically they box up a pile of horse manure, cow shit or zoo shit then mail it to your enemy. As fun as that sounds .. I think the glitter will be more evidence! Source: about 1 year ago

Can get one of those cards filled with glitter. Companies like Shop Your Enemies Glitter provide such a service. Source: about 1 year ago

Envelopes full of glitter. https://shipyourenemiesglitter.com/. Source: over 1 year ago

Here you didn’t ask for it, but it is what you are looking for. Source: over 1 year ago

A lot of the big concepts are best learned through analogies because analogic thinking is how you're able to learn subsequent languages so quickly. Codeanalogies.com is an excellent resource for that. Source: over 1 year ago