Meaning of こともあるもんです


How should I translate こともある in this sentence (response to '何それ?'):

> あなたが辞書を使うなんて、はなはだ珍妙なこともあるもんです

Literal translation of はなはだ珍妙なこともある would be 'there are also really odd
things', but that makes no sense.

One suggestion seems to be that it means 'among other things' so I get:

> Because (もん), among other things (こともある), it's really odd that (なんて) you use
> a dictionary

Is this a correct translation? If so can anyone offer a suggestion as to how
we arrive at that from the literal translation? (and why do I have to keep
reaching for my advanced grammar book to read a children's story? It's really
dispiriting.)




The latter part is in line with: "wow, strange things happen!"

もん ([ものだ](http://dictionary.goo.ne.jp/leaf/thsrs/17282/m0u/)) is used here
emphatically to indicate emotion (hence I decided for "wow").

こともある literally stands for
[occasionally](http://ejje.weblio.jp/content/%E3%81%93%E3%81%A8%E3%82%82%E3%81%82%E3%82%8B),
but as the English verb _to happen_ already covers the occasional aspect the
meaning can be expressed just with "things happen".




The latter part is in line with: "wow, strange things happen!"

もん ([ものだ](http://dictionary.goo.ne.jp/leaf/thsrs/17282/m0u/)) is used here
emphatically to indicate emotion (hence I decided for "wow").

こともある literally stands for
[occasionally](http://ejje.weblio.jp/content/%E3%81%93%E3%81%A8%E3%82%82%E3%81%82%E3%82%8B),
but as the English verb _to happen_ already covers the occasional aspect the
meaning can be expressed just with "things happen".

