When you are 5th pick support main and 4th pick isn't a very good ADC.
4th: I'm not good ADC, can I support? You: ... fine... 4th: Picks Nidalee
Starts Doran's Ring, 2 potions, forgets trinket. (takes CS) "Warding is the jungler's job!"
There should be an instruction video on how to support properly, I get these way too often.