"Oh no, i smell gas! is there leakage?"

"don't worry! do you know that you should do install gas connection from a trusted technician, perform maintenance every three years, change gas piping every five years to prevent gas leakage, which can lead to fatal acidents?" union gas. your trusted partner.(ad ends here.)

"erm no. i haven't done any of those."

"oops. i guess there is indeed a leakage. erm... goodbye."

KABOOM.