I was trying to go to KL whilst in Perth, Australia but didn't realize I had less than 6 months on my passport (they let me travel from Canada to Australia no problem). So while checking for my red eye flight to KL, Air Asia staff were like,

'Miss, we could send you there, but there is no guarantee they will let you in the country, and you may have to be detained overnight in a holding cell as a result'.

Naturally, I passed. I'm going to make it there one day though!