I'd have to say that certain grains along with a cup of coffee do so for me; how about you?
Order the following for lunch tomorrow and you'll be assured of a "dump attack" within < 10 minutes.
1 x chocolate milkshake with vanilla icecream, malt and lots of whipped cream on top.
The sugar blast will literally "push" even the most "hardened logs" stored over the winter up yur ass to the outside world faster than Lou can say "Hey, thats $20 bucks for a photo, punk!"