Holding grudges, going to the toilet in pairs and taking an age to get ready are things women do that apparently leave men scratching their head.
The top 50 things which surprise men about the fairer sex have been revealed in a survey - and they're hilarious.
1. Their mood swings
2. How shopping is more than just shopping, it's a social event
3. The time it takes them to get ready
4. Their ability to hold grudges
5. How they remember absolutely everything you say
6. Why they think men are mind readers
7. Why they say "I have nothing to wear" while standing in front of a full wardrobe
8. Their obsession with shoes
9. Why a handbag is so heavy and has so much stuff in it
10. Why a haircut and colour costs so much money
11. Their obsession with handbags
12. Why they go to the toilet in pairs
13. How they can sit in a hairdressers for three hours and not look any different
14. Hoarding cosmetics and toiletries
15. Hoarding things
16. Why they spend ages in a shop but still leave with nothing
17. Why they talk on the phone so much
18. Why they're always cold
19. Why they buy clothes but never wear them
20. Why buy clothes and try them on at home only to return them later
21. Why they wear shoes they can't walk in
22. Why they buy shoes and never wear them
23. Their love of candles
24. Why they clean so much when visitors are coming
25. Why they put extra pillows/cushions on the bed which they don't use when sleeping
26. What are 'fat days' and 'thin days'
27. How they can find it so difficult to understand the 'off-side' rule
28. Why they always want to talk about their feelings
29. Why they buy a salad when out for dinner then eat all your chips
30. Why they are always on a diet
31. Why they never go anywhere without makeup
32. Their love of Made in Chelsea and TOWIE
33. Why they bother painting their toenails in winter
34. Why they talk about soap characters like they know them personally
35. Why they actually enjoy wrapping presents
36. How they can read so many books
37. Why they have so many different shampoos in the shower
38. Why they make us empty the bins
39. Why they spend over an hour styling their hair
40. Why every pair of shoes matches a handbag
41. Why they always cry at films
42. Why they always fall asleep during a film
43. Why they can't live without chocolate
44. Why they talk about their outfit for an event weeks in advance
45. Why they care so much about the laundry being put in the washing basket and not on the floor
46. Why they wear makeup just to the local shop
47. Why they cry just for the sake of crying
48. Why they need to get into their pyjamas as soon as they get home from work
49. Why they wash up immediately after eating
50. Why they enjoy food shopping