Pass a note to the organist asking whether he/she plays requests
See if a yawn really is contagious
Slap your neighbor. See if they turn the other cheek. If not, raise your hand and tell the minister.
Devise ways of climbing into the balcony without using the stairs
Listen for the speakers to use a word beginning with 'A' then 'B and so on through the alphabet.
Sit in the back row and roll a handful of marbles under the pews ahead of you. After the service, credit yourself with 10 points for every marble that made it to the front.
Using church notice-sheets or newcomers cards for raw materials, design, test and modify a collection of paper airplanes.
Raise your hand and ask for permission to go to the lavatory.
Whip out a hankie and blow your nose. Vary the pressure exerted on your nostrils and trumpet out a rendition of your favorite hymn.
Unobtrusively draw your arms up into your sleeves, turn your shirt inside out.
Try to raise one eyebrow.
Think about your chin for an entire minute.
Twiddle your thumbs.
Wiggle your ears so that the people behind you will notice.