Closing and reopening Tinder so everyone who's already liked you appears at the top.
When you see a friend's girlfriend on Tinder and don't know whether to tell him or not.
The unnerving sight of a group of women playing Tinder in your vicinity while howling with laughter.
The ominous feeling you get when your friends accidentally see your profile picture and you know a piss-taking is about to commence.
When someone looks far hotter in their second or third photo than their first.
The one that got away (by never swiping back).
The tactic of swiping everyone right without looking just to increase your matches.
When you see a friend, and swipe them right anyway.
How you feel when someone you've been chatting to suddenly stops replying for no reason.
When you've been through someone's photos several times and still can't decide whether they're hot or not.
When someone's face is hidden in all of their photos.
When, in a moment of self-loathing, you delete Tinder from your phone.
When you get chatting to someone just as drunk as you.
When you get the 'there are no more matches in your area' message and realise you've exhausted a 10km radius of London.
When you Tinder while on the toilet. Which let's face it, is now every time you're in there.