You know you do it…

Ever caught sight of your face in the mirror when applying mascara and had to resist the urge to laugh? Say hello to your ‘mascara face’ – and don’t worry, we all have one.

After discussing our various mascara-applying facial expressions in detail, The Glow team decided to film them in action. Oh boy. (Take a look at our mascara faces at their best. Post continues after video.)

While most of us tend to open our mouth super wide, none of us actually had any idea why we did it.

Some theories claim it can help stop you from blinking while others say it’s more to do with copying how your mum applied hers. (Post continues after gallery.)

Becca The Ultimate Mascara

Bobbi Brown Intensifying Long Wear Mascara

Clinique Lash Power Long Wearing Mascara

Clinique High Impact Curling Mascara

djv Beautinizer Fiberwig Mascara

Estee Lauder Double Wear Zero Smudge Lengthening Mascara

Estee Lauder Double Wear Zero Smudge Volume and Lift Mascara

A mascara with a patented curved wand reaches every lash from corner to corner

MAC Opulash Mascara

Napoleon Perdis Mesmer-eyes Mascara

Napoleon Perdis Magnif-Eyes Mascara

Napoleon Perdis Mesmer-eyes Mascara

Covergirl Professional Remarkable Washable Waterproof Mascara

Kevyn Aucoin The Volume Mascara

Mirenisse Secret Weapon 24 Hour Mascara

Too Faced Cosmetics Lash Injection Mascara

I love Too Faced cosmetics. Personally I'm yet to try the Lash Injection Mascara for myself by my research (internet forum stalking) tells me great things. It's on the list.

But whether it actually helps you apply your mascara better or it’s just a totally involuntary action, there’s no denying the results are hilarious.

What’s your mascara face?