These are all gramatically correct sentences.

[Daily]

Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo.

James while John had had had had had had had had had had had a better effect on the teacher.

That that is is that that is not is not is that it it is.

 

[Syed]

That is what this is this is what that is if that is this then what is that?

 

[shakaka]

That is what this is. this is what that is. if that is this, then what is that?

that's 3 sentences, not one.

 

[Tezlin]

This is gay is this what this is is this this is this gay?

 

[Rushie]

Well then if you had had been had had you had a good time had you been had or if you had not been had.

 

[Dustein]

James while John had had had had had had had had had had had a better effect on the teacher.

You forgot punctuation.

James, while John had had "had had," had had "had." "Had had" had had a better effect on the teacher.

 

[wombakage]

/life

 

[DrDeath]

I saw this on wiki once.

 

[claw bogy]

Yall nigga's are sure of this?