The Test Tube Apparatus.

I'm never wrong, I'm always right.
Look, see here, I wern't my fault tonight!
But really I'm a stupid whore,
come knocking at my red-light door.
Go away! Wait, no, come back, stay!
Tonight you wont even have to pay!
So come on in, I'll say with a grin,
I am so ugly, from within.