When it gets this hot, I'm not my usual cool calm collectivist self so I need advice on what an appropriate response to this would look like:

My housemate turned on the heating for several hours yesterday, deliberately. Then, today, she lost the key for the electric meaning no showers or Internet or tv.

I was meant to be cooking her my 100% vegetarian lasagne tonight and I cant use the oven now. might serve her uncooked lasagne. She's got an important job interview this week and I'm moving out soon and she fell off her bike so I'll probably just laugh and telll her she's a scatterbrain. She's one of those people who it's difficult to stay annoyed at but where is the justice in that?