Question

آی نفس کش؟

Answer 1

I callenge anybody who has the guts to fight with me, if any!

I callenge anybody who has the balls to fight with me, if any! -> not polite

I challenge eveybody!

I need an opponent (challengee)!  -> I think "challengee" is an artificial word, but perhaps in future we will see it in the dictionaries; like "noob" that was not present in LDOCE v.5, yet added in its 6th edition.

I defy everybody!

Answer 2

من تو فیلم ها دیدم. اول طرفین رو چلنج می کنن بعد می گن:

Anybody? 

بعد از یک مکث کوتاه هم اگه بخوان طرفین رو تحقیر کنن و بگن "می دونستن کسی حریفشون نیست" می گن:

Thought so!

که در این لحظه یهو یه قهرمان از وسط جمعیت فریاد می زنه: "من"!