"Spring Surprise?"

Aaah, that's our speciality! Covered in darkest, velvety smooth chocolate, when you pop it into your mouth, stainless steel bolts spring out and punch straight through both cheeks!

If people pop a nice chocky in their mouth they don't expect to get their cheeks pierced! In any case, it is an inadequate description of the sweetmeat! I shall have to ask you to accompany me to the station.