Russian ⇄ English

ты должно быть шутишь stresses
amer.	you must be shitting me (same as "you must be joking" or "you can't be for real" Val_Ships)
ты, должно быть, шутишь
amer.	you must be shitting me (same as "you must be joking" or "you can't be for real" Val_Ships)
Ты, должно быть, шутишь!
gen.	you got to be kidding me! (Franka_LV)