Alien in the toilet?

Something weird happened in our school toilet today...
One teacher claim she saw an 'object ' coming out from the toilet bowl with dark spot on the head.
Then...the guessing game begun....
Could it be a snake??? A lizard??? A peeping tom??? An alien???
I had to minimise my visit to the restroom the whole day...
Towards the afternoon...mystery solved. It was only a small lost monitor lizard (biawak). A male teacher saw it twice lingering behind the school toilet...