This one is easy as I LOVE my mascara! It is Rimmel Volume Flash Mascara:
It's relatively cheap for a mascara (around £6 depending on the shop) but I have yet to find a better one. I usually apply a couple of coats, but with three I can achieve a false lash effect. Even though I have recently started wearing falsh lashes on nights out, I still use this over the top as it is just a great mascara. I would recommend it to anyone.