Scary

I'm scared but in a productive way.

~ Daniel Harthausen

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The clown here reminds me of the old Officer Ug (or is it Ugh?). I guess now it's "Mr. Yuk." Anyway, it was a campaign when I was a kid to discourage from eating poison. I remember one of my brothers was very scared of it. I can't remember which one. 

That's an example of being scared in a productive way. Being too scared to eat poison gives you the chance to be scared again in the future.

Which is like being scared of clowns trying to sell you cotton candy is productive because cotton candy is gross and clowns are terrifying.