The name's Bond, Covalent Bond
Pop,goes the weasel.
Because of their Crystal Balls EDIT: I'm not sure if anyone's posted this before my mum's sister emailed her from across the globe.(New Zealand) I laughed so hard I thought I'd put it here. Credit goes to my Mum's sister though.
I'd like some H20 please.
One goes to the bar for a cold one. The other goes to a morgue.
Her: Yep, and pillows don't talk. I think we're bonding.
The noble gases, because they can't form bonds