I kind of feel similarly about certain picks. I get worried when someone chooses them, because the summoners behind those picks tend to have a certain...I don't know. Inefficiency? Inexperience? Like they think they look good and start using them without realizing they do, in fact, have weaknesses.
Examples of champions I get worried about if I ever see them picked on my team:
(Inside Thoughts: Please, just, know what you're doing to some reasonable extent. I don't know what it is with you Udyr players, you're either godlike or astonishingly terrible. Please don't pick him just because you got gifted Spirit Guard, which everyone seems to freaking have.)
(If I hear one more Nasus say anything like, "wow took three of you to take me down, noobs", I'm...Not going to say anything anymore and just keep the game moving.)
(Do you fire your big frosty arrow straight from the Nexus to a lone champion on the other side of the Rift and don't have teleport, or do you save it for when it might actually hit something, or even if it does, it'll actually help? Like, you can hit it occasionally, right?)
(I've seen more toxic Graves than any other champion, by far, no question. Don't be one of them.)
(Please get Flay first. Please get Flay first. Please. Thresh is not just a tankier Blitzcrank, don't play them exactly the same.)
(You know you can't solo dragon at like level 2 anymore, right?)
(Understand fully that you're just not going to be very good late game. Just, get that that's not your purpose.)
(I know this guy is a lot more difficult than he appears, but you don't have to use the second effect of Paranoia. Really, I'm not kidding. Any time you see them grouped, or aiming an important skillshot like Caitlyn's Headshot, pop it. Its second effect is for early-game, its first effect is an endgame teamfight winner.)
(Any summoner at all after they lock in): "first time this champ" (So...You didn't even do a custom game first to test them out? Don't say you read a guide, that's very much the exact wrong follow-up answer. I'd honestly prefer "no" over that.)