Charles N'Zogbia smiling. It usually means we've done really well at something and he's been a part of it. So it's a rarity.
I love witty and/or clever lyrics. It's part of the reason I listen to so much rap. I love a line I can identify with, or in some cases, laugh at.
I adore a good breakdown/drop in the heavier or electronic music I listen to. It's one of the sections I look forward to most.
Guitar solos can - musically - be the most beautiful and emotive thing ever, at the time at least.