Farting in church

[checkpoint]

An elderly couple goes to sunday mass. After a while the woman starts to feel her gas building up, but she doesn't dare to let one rip. But after ten minutes or so she just has to fart. To her pleasant surprise it's a complete silent and odorless one. She repeats the process a couple of times and is quite satisfied. After mass, she says to her husband 'Well dear, I had to fart a couple of times back there, but thank God they were both silent and odorless'. The husband just grabbes her hand and rushes to the car. She askes 'What's the rush dear?'. He says 'We got to hurry back home and replace the batteries in your hearing aid.....'