First, a stat: only 5 teams have ever managed (in 60 years) to overcome a home-leg loss to win the tie. Food for thought. And now, the summary, from "most obvious win for the away team" to least.
-Schalke 1 - 6 Madrid: It's over guys. I'm sorry to be the one to break the news but it's over.
-B. Leverkusen 0 - 4 PSG: I don't think I'll bother watching the second leg tbh. Just a feeling.
-Zenit 2 - 4 B. Dortmund: Zenit have been very poor in the group stage and, although they did manage to score at home (one of the three teams to achieve this! Credit when credit is due), their chances of getting a 0-3 at Dortmund are... just not there.
-Arsenal 0 - 2 Bayern: Admittedly, last year they almost (read: did not) managed to win in a similar situation. Except now Bayern are the doomsday machine of hell and Arsenal won't have their unpronounceable first-choice keeper. Nobody will blink if Bayern go through easily.
-Man. City 0 - 2 Barça: The year when it seemed they could do it, City failed terribly. Winning at the Camp Nou is legendarily hard, specially when you have to score at least three times. Barcelona are admittedly on a slump lately but you'd hardly notice looking at the first leg, so it's not like City have anything to cling to.
-Milan 0 - 1 Atlético: Again, Atleti are in a sort of slump lately as well, but this Milan side may be one of the worst in modern history (if not THE worst), and this Atlético are ridiculously good at safekeeping a score, so... Might be the closest tie of all, but still not looking good for Milan.
-Galatasaray 1 - 1 Chelsea: The Blues have the upper hand there, clearly, but if they play as abismally as they did in the second half today, the match can be fun to watch.
-Olympiakos 2 - 0 Moy. United: I WILL watch this. And laugh. Or be endlessly surprised. Either or.