[smnrchrds]

My favourite example: "banana" has three a's, no two of which are pronounced the same.

[BalinKing]

I think I pronounce the first and last a's the same (specifically, as /ə/)... it must be a dialectical difference (mine is General American English).

[nulbyte]

I've think I've heard bina:na:, bina:nɚ, and binænə, in addition to bənænə.

[smnrchrds]

I think you are right.

[zarzavat]

For me the first a is reduced to almost nothing, the second is a long vowel and the last is a schwa.

[rgoulter]

That's a good example. I am amused by "record" being pronounced differently whether it's a verb or a noun.

[auxbuss]

They're called heteronyms, and there are a lot of them: https://en.wikipedia.org/wiki/Heteronym_(linguistics)

[auxbuss]

panorama is similar.