Winning the EL and FA Cup. Because ultimately, winning things is the point of football and we hadn't won much for a while, or since.
Apart from that, the PSG away win and that glorious mini-run where we smashed citeh 4-2 and dominated Liverpool at Anfield before promptly losing at home to West Brom. The 5-0 away win at Bayer Leverkusen under Moyes and the 60 seconds of delirious joy following Evra's thunderbolt away to Bayern. The 4-0 win over QPR after signing Falcao, Di Maria, Blind etc and then racing into a 2-0 lead away to Leicester in the next game. Felt like something really good was happening. Didn't last long.
Our multiple away wins at citeh (let's not mention the home games). The 2-1 away win at Juventus, I'd pretty much forgotten how it felt to win a game against a genuine European power, even if it was a bit jammy
Scoring four, five, six goals in a game under Ole. How many years was it between us scoring five against Leverkusen and the next time we did it? Under LVG I went four whole months without United scoring a goal at my end of the ground. FOUR FECKING MONTHS. I thought Moyes was bad, then LVG came along and was more competent but watching us play was like witnessing the death of anything enjoyable about football. Then Mourinho came along and was arguably worse, as well as massively more toxic.
The 2-1 win away at PSG last season. Felt so good just to be back in the CL, and then we went and did that in the first game.
Recently, I've taken to celebrating small victories. The comebacks against Villareal and Atlanta had me leaping around like a crazed gibbon
You come to appreciate the small things more when you're no longer winning the big things.