Know your offensive mustaches.

The Hitler:

The double Hitler:

The bilateral Hitler:

But these are just sideburns.

The Chin-Hitler:

It’s a soul patch! My girlfriend likes it!

The 50 Hitlers:

I just haven’t shaved! It’s not a statement!

Technically, every dog is covered with Hitler moustaches.

And we've only covered facial hair Hitler mustaches so far. The rest is left as an exercise for the reader.