I played it on Hard, which was a pretty good challenge, first, then I started a new game on Solid Normal (which is normal leaning towards hard) for the sake of showing it to a friend who played it for a little while and I can't even imagine how easy VERY easy is compared to this. Seems like a huge discrepancy to me. I got through the first 2 acts with no Alerts, not even trying to be extra careful or anything.

anyway, I haven't seen this Easter egg posted yet so:

Shake your controller while talking to Rose.