French: hétérogénéité, ça a beaucoup
 d'accents.

 Polish: welcome to sunny Łódź.

 Here's how you say "tax return" in Thai:
 คำร้องขอคืนเงินภาษีอากร

 This Mongolian person's twitter username
 character is not a soft-hyphen:
 ᠭ-ᠪᠢᠰᠢᠷᠡᠯ

 Let us all worship at the shrine of Emoji: how
 else could you throw a pile of poo at a
 snowman?
 💩→☃

 This sentence is full of non-breaking spaces
 but it'll be broken anyway.

 I put a hyphen in
 llanfairpwllgwyngyllgogerychwyrndrob
 wllllantysiliogogogoch and it ended up as a
 space.