How about...

Check the that you've got both screws tight on your clipless pedal's cleat on your shoe...otherwise you ain't getting out!

Bring fairly new glueless patches.

Stop for kids as they'll always, unpredictably move towards you at the last moment

Bring something to wash out the bugs from your mouth

Be ready to ditch off the path if you see a group of riders coming toward you that aren't in a single file

Leave your pets at home; what makes you think they want to go biking with you?

Fill a bottle with ice so you have a cold one for the return loop

Don't tighten the valve nut on your tubes tight, or you'll get a valve leak

Follow a faster rider - you'll be home quicker

Wear basic bike clothes, but funky socks - they always start a conversation - especially those with poker hands, dogs and kitties

Lube has so many purposes, even calming road rash in a pinch - take some along