Common things you don't know how to do

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I can do that.

Whistle :-(

I can't blow bubbles with gum either.

I don't know how to change a spark plug in a car. I have done it loads of times with numerous small engines, but with a car, I don't even know where the spark plug is located lol

Ha, this brings up the memory of when my first girlfriend taught me how to blow gum bubbles. I had never been able to figure it out on my own. I still don't know how to explain it; it's a trick with your tongue. But yeah my first girlfriend taught me one day. To her eternal credit, she didn't laugh at me when I thought I did it but all I was blowing was spit lol. After a little bit I got the hang of it, and I can still do it today.

Pop the bonnet on my car. Every time I need to I forget how. I feel like such a clichéd pathetic female each time.

No idea how to use a smartphone.

Ride a bike.