Any time someone trades me a Fletching, Bunnleby, or a Scatterbug, I just sit there, stare at my screen for a second, and then think "It's people like you that make the world burn". I'm usually trading good IV Pokemon, HA Pokemon, stuff that people would appreciate, but sometimes I just get those three above in return or other REALLY easy to get Pokemon.
Although, there was one time... I got a Japanese Tyrunt, Jolly nature, 31 IVs in Attack, Defense, and Speed, pretty much ready to be competitive. I just sat and stared at my screen and then thought "It's people like you that give me hope for humanity." And sometimes I'll get starters, HA Pokemon, and other good IV, ready to be used for competitive battling Pokemon, those days are awesome.
And alright, so I don't actually say those things in quotes above, that'd be overreaction, but still it's annoying to get a route 1 Pokemon in trade from something I take a long time to get. (HA Pokemon, etc.)