You'd think the Doctor would take some time to make a list for his companions titled "What to Watch Out For." Item one would be Daleks, obviously, since no matter how many times he wipes the salt shakers out of existence they're always there. Number two would be Cybermen, because they're really easy to spot with the whole "You will be assimilated" catchphrase and by completely ineffectual. The third would be somewhat confusing because it would be those aliens from the silence that you forget once you look away from them because the entry would be like "Whenever you run from something but can't remember what it was it was probably this thing. Which I can't really describe because I forgot what it looked like."
The fourth one, which is really burying the lead here, would be the Weeping Angels. It'd go something like "Those stone statues you see that look like crying angels? They're not crying. They're, uh, Weeping Angels. They'll kill you really quickly. Unless they don't for plot reasons. It depends on the day."
At least that way, when Clara sees a stone hand sticking out of the ground she won't be "Hey its just a statue" and the Doctor won't have to go "No it's not a fucking statue Clara it's a fucking harbinger of death get the fuck away from it."
But then, if the Doctor actually did do those things, he wouldn't have the opportunity to make those dramatic turns in the snow when danger is afoot. The theatrical dick.