Steady lah! Singapore's unofficial language took to the skies yesterday - or so it seemed.

Budget airline Jetstar announced it was introducing Singlish as its official customer-facing language, offering "lelong fares" that could be "faster choped" with cabin crew trained to speak Singlish on flights.

Its Facebook post and video attracted more than 140,000 views and 1,600 likes - though the staff names in it, like "Prankash", "April" and "Fuler", gave the game away.

Jetstar was one of several companies here to join in the April Fool's Day fun yesterday - though some of its customers actually thought the airline's idea was a winner.

One person said such a service would be "relevant and relatable".

Jetstar said that instead of telling passengers to "fasten their seatbelts", cabin crew would ask them to "make sure your seatbelt kiap tight tight". The no-smoking announcement would go: "Cannot smoke anywhere hor; if smoke detector goes off, you jialat I tell you."

Meanwhile, restaurant booking app Chope's April 1 jape was slightly less believable; it claimed to have produced Asia's first virtual food-tasting technology. Lick by Chope supposedly allowed customers to pull up a photograph of a food item on their phone which they could taste by licking their screens.

Email service Gmail offered users emojis along with suggested text replies that they claimed did "a better job of plumbing the emotional depths of one's soul".

However, one of them backfired. A button to send an email with a "mic drop" showed an animated character dropping a microphone to emphasise the end of a conversation. Gmail later disabled the button after it caused "more headaches than laughs".

Users on Gmail's help forum asked how to undo or disable the function after they hit it by accident when sending important emails, only to find themselves unable to receive the replies.