What does this joke mean? I don't get it, and it's bothering me.?

[Heather1]

Guy1 : Did you know that "sugar" is the only word in the english language that the "su" makes a "sh" sound?
Guy2 : Really?
Guy1 : Yeah, for sure.

 

[McMuffin]

sure also makes a "sh" sound. therefore he's a dumbass!

 

[BlueHeart]

sugar and sure both make su sound like sh

 

[Kas]

dont' have a clue

not a joke to me - I live in the USA

 

[ActualSize]

The su in sure makes the same "sh" sound; so the authority has just disproved himself

 

[NasssSssa]

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[ganglymoose54]

the word "sure" also makes the "sh" sound

 

[Debby]

Wow...either reiterating or name calling. Hmmm... Anyone got a clue as to why questions/jokes bring this kinda behaviour out in people?

For me, this "joke" got me to thinking about other words. Kind of a brain teaser......

 

[Nonentity]

The joke is that "sure" makes the same "sh" sound that the guy claimed only "sugar" makes.

 

[mmBeautifulTragedymm]

uhm sure make the same sh sound duh!