Crazy Calorie burns!

My colleague gave me this cool little bookmark at work today that has how much calories the average adult burns in 30 minutes with various daily activities.
I thought I would share as some of them I found quite unbelievable but according to the Harvard Health Publications website its accurate I probably wouldn't log any of these myself but it still makes me feel better about whatever I'm doing. Your thoughts?

Sleeping: 23 calories
Watching TV: 28 calories
Reading: 42 calories
Going toilet: 44 calories
Queuing in a line: 47 calories
Computer Work: 51 calories
Light office work: 56 calories
Meetings: 60 calories
Sitting in class/lecture: 65 calories
Milking a cow: 88 calories
Camping (not sure if this is just setting up a tent or making a fire, etc.): 92 calories
Billiards: 93 calories
Cooking: 93 calories
Bowling: 112 calories
Frisbee: 112 calories
Food Shopping: 130 calories
Housework: 135 calories
Horse riding: 149 calories
Washing a car: 167 calories
Snow shovelling: 223 calories
Firefighting: 446 calories - Think I'll change careers