My pub crawl etiquette (I know, that sounds fairly contradictory...) -

Buy something (beer, shot, drink, soda, water, cake, festival, chicken, something!) at EVERY stop.
Do something silly at EVERY OTHER stop.
Egg on folks doing silly things at the ALTERNATING stops.
Tip Lenbert $10 minimum when you leave the crawl.
Don't forget to tip Lenbert if you leave somewhere mid-crawl.
Don't forget to buy something (beer, shot, drink, soda, water, cake, festival, chicken, something!) at EVERY stop.
Tip Lenbert more if you have used his concierge services.