Trying to remember in order:
13/14:
Januzaj's season
Evra's goal against Munich
Moyes being sacked
14/15:
Signing di Maria and Shaw
3-0 against Spurs, 2-1 against Liverpool, 4-2 against City, 4-0(?) against Villa run of games.
15/16:
Martial's season
Memphis' performance against midgetland
Rashford's debuts against midgetland and Arsenal
Martial's winner against Everton in the semi
The FA Cup final win
Sacking van Gaal
16/17:
Signing Pogba
League cup win
Rashford's free kick against Celta
Rashford's goal to send us to the final
Harrop's debut
Winning the Europa
17/18:
Matic's winner against Palace
Coming back away to City to win 3-2
18/19:
Sacking José
Ole's initial winning run
PSG
19/20:
Kicking off the season with a 4-0 victory over Chelsea
These are just my personal faves.