Being impressed and a little scared at the same time

"You have felt impressed and a little scared all at once"
Which things might have caused such a vibrant pallet of feelings, perhaps:

Watching a marathon runner that didn't look like one , walking past your neighbors tip top entrance front every day, reading the latest futuristic article in the NY Times, biting into a vegan cupcake, a blogger, walking down and up the Grand Canyon in one day, being allowed to launch an airspace shuttle, etc. ...

But what does this mean, 2 opposite words "saladed" together.
Lets looks at them seperately:

Tim Burton thinks being scarred is a good thing:

While the Blow Monkeys say: Don't Be Scared of Me:

Being scared could lead into fear and in the worst case steal your dreams:

fear is the thief of dreams:

some people also get a joy out of scaring other people:

Don''t be scared....:

Or watching others being scarred:

little boy being scared:

Looking at "impressed" without being scarred

Nathan Baker says: I am impressed by window washers:


A truck can be impressive too: Impressive Truck Climb:

Impressive girl archer:

Pretty impressive...:

Is it being in a situation, not knowing the outcome, not knowing if it'll be good or bad,not knowing anything but enjoying whatever this situation is?