Arrow and Teen Wolf star Colton Haynes turned a recent night out into a what-not-to-do-on-a-first-date guide for his Twitter followers as he eavesdropped on a couple's disastrous romantic liaison.

The actor found himself sitting next to the lovebirds at a restaurant recently and when he realised they were on a first date he decided to pass the time by giving his fans a blow-by-blow account of the awkward hook-up.

He opened his impromptu dating blog by writing, "I am sitting next to the a couple on their 1st date who met online and it's a conversation I have to live tweet about right now. Stay tuned."

He added, "He Just Called Her The Wrong Name!!! After 30 mins (minutes) of their date, he called her Terry... her name is Tracey."

And there was more to come as he tweeted: "U guys... I am now sweatin laughing. I'm a terrible person but he just said he dated his second cousin once. I Swear On My Life He Said That."

In total, Haynes posted 23 tweets about the first date from hell.