I was one of the very first developers with an app published on Google Play store, and as a "thank you" for having one of the first apps with 10k+ downloads(which wasn't difficult when number of apps on the store was measured in hundreds), Google wanted to send me the Nexus One phone - which was great, except that the email I got from them looked like scam, it was basically "hey you won a phone, click on this link and fill out this google spreadsheet with your details!" - no official google logo, it was just plain text email and the spreadsheet looked dodgy as hell. So I ignored it, until I read about the giveaway on a reputable site few days later - and yeah, I filled out the sheet and the phone arrived few weeks later. But it was very very easy to ignore it.