The top 30 most unexpectedly delightful things to happen include pulling out a bank note from the pocket of an old pair of jeans, getting a surprise refund - and a compliment from a stranger.
The poll, of 2,000 adults, found 36 per cent also love it when someone lets them jump the queue in the supermarket.
Hearing their favourite song on the radio also raises a smile for 35 per cent.
Driving through a run of green lights, catching a whiff of a familiar smell from your childhood and finding a treasured lost item also feature in the top 30 list.
The study also found unexpectedly delightful things happen to people an average of twice a week, with 78 per cent claiming that when it does occur, it automatically puts them in a good mood.
But it’s not just being on the receiving end of these unplanned surprises that brings the most joy, as 77 per cent of those polled find making others happy improves their mood too.
Which is why it’s something 36 per cent try to do often.
Such acts include smiling as they walk past another person (52 per cent), just being there to listen to a friend (50 per cent) and telling someone they’re proud of them (38 per cent).
TOP 30 UNEXPECTED MOMENTS OF DELIGHT:
1. Finding money in a coat or jeans pocket
2. Getting a surprise refund
3. A compliment from a stranger
4. Someone letting you jump the queue in the supermarket
5. When the radio plays your favourite song
6. Receiving a bonus at work
7. Constant green lights on the road
8. Hearing your baby’s first word
9. Your partner randomly shows affection
10. When someone actually understand what you’re talking about
11. A familiar smell from your childhood
12. A loved one randomly tells you they’re proud of you
13. Finding a treasured lost item
14. Waking up before your alarm and getting to sleep for longer
15. Getting upgraded – like on an aeroplane or at a hotel
16. Thinking it’s Thursday – but it’s actually Friday
17. When a child starts conversation with you
18. Receiving a postcard
19. Hitting the exact number when getting petrol
20. When you get home from work to find someone else has cooked dinner
21. A work meeting gets cancelled last minute because the boss isn’t in
22. Seeing a funny car licence plate
23. Getting asked for ID
24. When you’re brought breakfast in bed
25. When you and your friend say the same thing – and it happens again
26. When your teenager wants to spend quality time with you
27. Your neighbour brings round a baked good
28. Bumping into an old schoolteacher – and they recognise you
29. Catching the eye of your favourite artist during their performance
30. Witnessing a proposal in public
