Minecraft 14w05a, Minecraft 14w06b, Minecraft 14w07a, Minecraft 14w08a
Windows 7, Java updated
Pickup an item in any gamemode, put them in any slot (1 to 9) and change the gamemode to spectator.
Press Q to throw the item.
I know that spectator mode can't pickup items, but the problem isn't.
The problem is: spectator mode can throw items in pressure plates, for example.
I'll continue my bug searching now. Sorry for my english.