>> https://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B%AF
>
> You may also like the proof that all triangles are equilateral:
>
> https://youtu.be/Yajonhixy4g

Doesn't that come under a different category of just being a trick/hoax 
though (a bit like all the 1=2 type "proofs")? As opposed to this 
assuming 1+2+3+...=-1/12 thing is actually useful in other areas of 
maths and science.

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