No, the sarcasm is obvious. It's just not very funny, and doesn't positively contribute to the level of discourse here.
Wait, true...true
X is used variously as true and false in Different languages, so why would you assume it means false in a language you have never used?
˙ɔıuoɹı sı ʇɹoddns ǝpoɔıun ou s,ǝɹǝɥʇ ʇɐɥʇ ǝʇɐɔıpuı oʇ ʇı buısn os 'ɹǝʇɔɐɹɐɥɔ ǝpoɔıun ɐ ɟןǝsʇı uı sı ssoɹɔ ʇɐɥʇ
All characters -- including every one in this post -- are unicode characters. The definingly-useful characteristic of the cross (or checkmark) is that it can't be represented in latin1.
Edit: Please :-)
which has this javascript code to convert:
SampleUtf8Char= would be more clear.