Although hamsters are absolutely adorable, as with most things that seem perfect, there are some 'flaws' as such with hamsters.
For instance, my hamster is always trying to escape from her cage. No matter how many toys I put in her cage, how many times I pick her up and play with her, or how many times I try to rearrange her cage to make it more interesting. She will always try to escape.
Even if I have just finished holding her and I put her in the bottom level of her cage, she will literally sprint back up to the top of the cage to try and escape.
Getting the lid back on her cage becomes a huge problem because of this, as I will reach over to slide the lid back on, and she'll stick her head in the gap and put her paws at the side of the cage and try to lever herself out of the cage... what am I going to do with you Willow..?
But the most annoying habit was her running in her wheel almost 24/7, so when I tried to go to sleep all I could her was her wheel rattling away...
tut tut tut.... but then I got her new silent wheel and that stopped... phew!
Even when the wheel was annoying, at least she was getting exercise even if it was noisy!
What are your hamster's/ pets' worst habits?