How do bugs get into a light bulb?

They can't get into the actual bulb itself because it is sealed. But they sure do like to get into the glass covers over the bulb!

A light bulb is a vacuum tube. Since it is a vacuum, there is nothing in it by definition.

O.

I have seen them inside of a lightbulb too and often wondered how they did that. Small bugs but still they got in.

The bugs are definitely inside the "vacuum"- sealed bulb, so it must happen in the manufacturing of them. Anyone know?