i've got one just like that! 
Its cause it is the tenth doctors sonic screw driver (though i have to say bow-ties are cool *fiddles with a bow-tie as i say that they are cool* )
hahaha yes they are cool! and fezzes too! I really wanted to get the 11th doctor's sonic screwdriver the one that goes *faching* when u click a button... yes.. cos thats so totally cool 
I really wanted to get the 11th doctor's sonic screwdriver the one that goes *faching* when u click a button... yes.. cos thats so totally cool lol nice
i know right
lol