Originally posted by LatecomerX:
After reading the joke, I had a cartoonistic imagination
that Mohammed turns around with sharp teeth and an evil grin and
spelled out the phrase in a flash. Then, staring at his teacher
with a pair of crimson-red eyes, he challenged her, "If you can
spell 'shut the [b]fuck up, dumblonde', I will return you
the biscuit - soggy". 
PS: No offence to anyone, by the way.
[/b]
that'll totally rule the teacher