Much like elephants, football fans never forget - particularly when it comes to refereeing decisions.
A high tackle from Nani during Manchester United's 2013 Champions League match against Real Madrid resulted in the winger seeing red.
Here's that tackle again...
https://www.youtube.com/watch?v=b09QzXjBQCA
As it happens, the very same referee who issued that card, Cuneyt Cakir, was in charge of Spurs' match with Borussia Dortmund on Thursday, and in a very similar incident, Tom Carroll caught a player whist his gaze was on the dropping ball...
Grudge-bearing United fans were very quick to respond to the double-standards that only resulted in a yellow card (ignore the incorrect date)...
https://twitter.com/aaronflan/status/707998491797286918
https://twitter.com/HowardCover/status/707998721552814080
https://twitter.com/MBBETTING/status/707998713747214336
https://twitter.com/offthepost/status/707998765333016580
They've got your number, Cuneyt.