As Manchester United seek to pull off an upset against Bayern Munich, they will need a game plan which compensates for the significant gap in quality between the two sides.
When Sir Alex Ferguson's United faced Jose Mourinho's Real Madrid last season, United fans feared the worst. Eventually the worst came to pass, but the performance over two legs gave heart to those who had come to believe that Madrid were in a qualitatively different league to United.
With Mourinho saying "The best team lost," per BBC Sport, Ferguson's men were tigerish in their hunger, fully committed and clearly capable of taking the game to their more expensively assembled counterparts.
In spite of that fixture being only a little over a year ago, it feels like a story of a bygone footballing era. Because, of course, it is.
David Moyes' United have been a vastly inferior copy of Ferguson's version. Every time United have faced a truly significant test this season, they have failed it, often dismally.
The games cited as exceptions, the defeat of Arsenal and the overturning of the deficit amassed in Greece, were enjoyable certainly, but both of those occasions come with a significant caveat in terms of the performance of the opposition.
Assuming "stay at home and take the 3-0 defeat" or "find a way to get at Bayern's pre-match catering" are not an option, how can United, this United, overcome their stiffest challenge yet?
It is a challenge provided by a team who have already won the Bundesliga, managed by a manager who knows exactly what it takes to achieve the highest European success.
There are no easy answers. Even with a perfect game plan, perfectly executed, United are second favourites. Here are some thoughts on how they can make the best of the situation.