I got a pop from imgcredit.xyz that locked my phone up last night. One of those "Warning! Your device is infected, call this number..." and then when you try and close it out it gives you 2 more pops saying the same thing every time until my shit froze. lol AND I have Adblock.
As a matter of fact, just got this from my PC with adblock on from imgcredit. The voice says that if I close the window they will disable my computer, my credit card info is being stolen, etc. lol I can imagine that's some pretty scary stuff if you're a novice.