You wouldn't DoS a car

from here and here (image source)

Sometimes whether a thing is an attack or a defense depends entirely on perspective. The motorcyclist could be trying to prevent his motorcycle from getting stolen, but the car owner can't go anywhere now because the motorcycle is anchoring him in place. You could make a lot of arguments about the motorcyclist knowing better, but this site has seen cars chained up as if they were bicycles, so I don't doubt this could have been a sincere attempt to prevent theft (even if it is ridiculous).

DDoS Attack socks

Product Page

I'm not sure how you'll turn these novelty socks into a conversation starter about DDoS attacks, but surely there must be a way. Why else have novelty socks if not to show them off?

Fork Bomb shirt

Product Page

So this conversation starter may look like a string of emoticons at first, but it's actually supposed to be a fork bomb and can open the door to talking about denial of service attacks.

Self Denial Of Service

from here and here

Epic self-owns aren't exactly what you expect from a militaristic world power, but I guess Russia isn't what it used to be.

Manual Denial Of Service

from here (image source)

Apparently a news organization couldn't find hacker stock photos that were over-the-top enough for their purposes so they hired an artist to create such an image? I'm not sure why they couldn't just stage their own hacker stock photo (just need a scruffy guy and some simple props), but here we are.

Why not both?

from here and here (image source)

It turns out this is a very effective way of stopping a car from being driven away by either a car thief or the rightful owner.

A bike thief wouldn't have a problem with it, though.