how do you tip a trashman?

i'm being serious on this question! our trashmen are the best! they've saved us numerous times from keeping our trash a few days longer or now, a week longer when we're just a bit late getting it out. today was recycling day and we got up too late last week to put it out. we almost missed it again today. i opened the door to peek down the street to see if any neighbors still had there bins out and they were stopped just a few doors down. quickly i ran to get our bin (which was overflowing) and as i was opening the door and stepping outside, they were driving past. out trashmen have great eyes though and saw me coming. they stopped the truck a little past our house and met me in the yard. then a gust of wind came by and blew paper from the bin around the yard. they helped pick it up! so how does one properly thank a trashman? saying thank you for rescuing me time and time again just doesn't seem like enough. and it's not as if i can't promise them stinkless trash on tuesdays!