I just noticed today that the five weapons for the Beast Hunters Terrorcons (combiner team), can combine into a giant weapon.
The instructions have the five weapons join together like a giant spear (but I have the two bladed weapons facing forwards so that it looks like an axe), which I never even though was part of their design (being able to combine).
I don't often look at the instructions, and I never saw it on any official images or on the packaging. And doing a search only came up with one image, which is the image link above.