Do your chips go cold while waiting for the ketchup to come out of the glass bottle at some restaurants? You can force some air into the bottle and speed the pouring process by using a drinking straw.
Photo by Ingrid Taylar Hints and Tips weblog FunAdvice recommends inserting a drinking straw into the ketchup bottle, pumping it up and down a few times, and then removing the straw. The extra air you just added should make the ketchup pour at a faster speed.
A drinking straw speeds up sluggish ketchup [FunAdvice]