“It’s exhausting to be right all the time,” the Know-it-all will tell you as he swirls his drink around his glass. “But I just can’t help myself. If I see an error, I have to correct it.” You may find this charming at first. Knowledge can be quite sexy, after all. "He's so clever," you'll gush to your slack-jawed friends. You revel in your new role as Marilyn Monroe to his Olivier, drinking in his fun facts, grammatical corrections and recommendations like lattes. But the trouble with a know-it-all is that...

This is it, then. It's official. It's getting hotter, you can smell barbecues and you're never three metres away from someone with a Magnum hanging out of their mouth. It's summer. While you nibble on picnic food, drown your sunburn in aloe vera and endure weeks of barbecue-related food poisoning, don't let these 25 losers make things worse for you. This summer, you should never date a man who… 1. Wants to "try that latest pop-up place" he's just read about. Summer is ruined by these ironic "burger n spiralized mango" joints...

We all have that oversharing friend, don't we? The one who posts millions of selfies or is always checking in on Facebook, drowning under the weight of their own humblebrags or passive-aggressive attention-seeking. And only the very kindest of us wouldn't have a quick sneer with other mutual friends – maybe fire off a bitchy text or a moany DM. "They're at it again!" And that's OK, that's human nature. Unless you're very careless or downright malicious, nobody finds out and nobody gets hurt. One opportunistic person wanted to take this...