you wake up in a cheaply made containment chamber, outside the chamber's walls you see a scientist sitting on a control room with a HeadCrab on a cat bed right behind it, it seems to be comfy. Either way the Scientist speaks

"Welcome to Will It HeadCrab! The show where we test the limits of both Science and Common Sense! Today we're gonna introduce a HeadCrab to this... uh... whatever this thing is, I don't really know about what this thing is as I've not cleared the opacity of the door yet... Even tho it's made from the most expensive thingamajigs ever to be bought from Home Depot. As I've said we will be lowering the opacity of the doors to see what this thing is"

He makes the door In which you are watching him more clearly Via a button, tho the door is not open

"Well, It's a strange thing nonetheless we will Deploy The Crab at a later time. For now we will ask a few more questions before we do that, Say... what's your name? Don't worry if you answer we won't hesitate and we will drop a Xenoparasitus Mutagenicus, also known as a HeadCrab. on your head regardless!"