Having a sambuka hangover and discovering that my then gf's new herbal toothpaste tasted of sambuka and puking all over the bathroom at the moment the toothpaste hit my mouth. 

I have some of those breakfast in a can things .  Brilliant invention.

waking up passed out sitting on the loo. standing up to make arrangements to throw up.

falling flat on my face as i'd been sitting for so long and my legs had completely ceased to function.

Horn. 

At various times with varying outcomes. 

Smoking and drinking gin and bitter lemon at 7am the morning after with my mates and our neighbours popping their head over the dividing wall to ask if we'd witnessed them just being burgled.

feeling so unwell that I had to let my friend drive a car with my head hanging out the back window for a couple of hours.

then feeling too unwell to even step inside an aircraft hanger with the doors open

Having a friend drive me to the pharmacy so that I could pretend I needed the morning after pill when it actual fact I was chasing the anti-nausea tablet that came with it. 

Having a girl get quite angry with me at a time when I could really really have done without any confrontation because she claimed that I was ignoring her after having been in her room the previous evening.

I was indeed ignoring her because I was trying to ignore everyone at the time but I didn’t (and to this date don’t) have any recollection of being in her room or what may have occurred therein.

Waking up with a hideous hangover on a hot summer day and stumbling into the living room of my shared flat to find my flatmate's mate Dave sprawled on the sofa in just tight boxers with his full gut including stretch marks on display.  Bear in mind this is the man who was known at uni as the Love Walrus...

Better than my flatmate though who in a similar state opened the bathroom door and found Dave enthroned with boxers round his ankles.

Waking up at 5:30am still in a tube and sat upright in a seat at Cockfosters station.