I love the way they can bite you and then blow you a kiss, pull your earrings and then say "being a good boy!". Almost pierce your lip and say "I love you!". Steal your dinner, biscuits, crisps etc. Throw seeds into your coffee cup, of course you don't know they've done that until you get to the very bottom! I love the way that they shake themselves, so that the dust and feathers fly everywhere. I love the constant practising to get a tune right. I love the way that housework takes three times as long with a tiel helping. I love the way they put their heads down for a scratch but then decide they don't want to be touched and would rather bite you instead.
Yep, pretty much everything about them really!