The pressure of seeming like a fun-loving person leads thousands to lie about what they did, with the most popular mistruth being that they went out on the town on a Saturday night.
Other top lies include dining at a top restaurant, going on a romantic holiday in the UK, or going on a training course.
The secret competition between colleagues appears to be a vicious circle, however, with almost three-quarters of adults believing that they are having less weekend fun than others.
Psychologist Corinne Sweet said: "The psychological condition, 'Weekendvy' that's currently hitting Britain is to do with needing to feel like an alpha male or female with high status.
"We don't want to admit that most of our weekend time is spent trying to catch up with housework, paperwork and endless chores.
"It's the horrible feeling that everyone else is having a better time than us, going away, partying or having fun."
What did you do this weekend? The top five lies
1) Painted the town red on Saturday night with their partner or friends.
2) Took part in an adventurous activity.
3) Went on a course or training programme.
4) Went out for a fancy dinner at a top restaurant.
5) Took a romantic break (but actually just re-told a story of a previous holiday).
- Daily Mail