OMG,
I can say n number of things about this...
Once I used to cry and complain to my husband about this - but kind of stopped thinking tat i've loads of better things to worry about

...
Here are the few funniest things tat wil happen to me in IL's house,
1. First and the worst thing is cooking - My SIL is about 6 yrs elder to me and she has been cooking for a long time and i was only 21 when i got married and I was only into experimental cooking - she always used to complain tat am not cooking good - I was not coz i had no experience...
2. Once she came to stay with me vn my hubby was away on a business trip - gosh this lady was over my head all the time - i've to leave home at 7 for work - i need to finish bfast and lunch for her b4 i leave and she will not be ok with anything less tat sambhar, rasam and a poriyal for lunch - and she'll complain for every bite - as i went to office, i called up my hubby and cried like hell - he came down in the next flight and sent his mom off tat day itself - she started singing to him too before boarding her bus and got nice replies from him

...
3. My SIL never ever goes to her IL's house, but though these people keep nagging me all the time, i make it a point to visit them freq - but for them only their DD is good and they have brought her up in such a way she always respects elders and her IL's are talking ill about her...
4. When I went to their house after my DS was born, she used to complain tat i dont have enough milk and will force me to feed him cow's milk - I will give her a sharp reply and keep mum - this lady willa sk her daughter how can her milk be enough for the baby even after 5 months? This kind of puts me off everytime i think about it - her DD was giving her DD cow's milk from birth though she was BFing.
5. Though I got BE free Seat in a reputed instituite and he DD was just into BSc and MSc and into research now, she is the most intelligent creature of all... she used to say - all below avg ppl are also getting into s/w industry -

I used to feel like hitting her on her empty head....
Am not able to forget lots of things and it still shoots my BP vnever i think of it....
Need to learn to give them back appropriately...