Emails like this.

Westpac Bank will add $150 AUD credit to your account just for taking part in our quick 4 question survey.
Only one suvery per card is allowed, if you own multiple cards you can run the survey again for each.
http://www.westpac.com.au/wps/wcm/co...eyID=DezKLt4g3

What do you think? Seems legit to me.

This is required, just in case.