Petrified wood Puns

I showed my dad some petrified wood, his response was "that's funny, it doesn't look that scared to me"

http://i.imgur.com/A5XahdJ.jpg

So my friend was burning off yard trash (controlled burn...put away your pitchforks reddit) from the lot he recently had cleared during the day. I show up at his place in the evening and we go outside to see how much debris was left. He pokes some of it with a stick and hears a hard glass sound and says, "What the heck is that?!" I lean down to look at it and reply, "I think it's petrified wood....but I have no idea what scared it." He rolled his eyes, and his 16 year old daughter laughed her ass off.