you see, leslileslie, dave's girlfriend of eight years is pregnant with a by by girl they're going to i heard the new trend is daddy showers. guys get together, they buy diapers and drink beer. i said that seems kind of classless. let's do this big. >> reporter: with just a few hours nf the boys show up, dave and his best friend rich are making some last minute stops. dave wants to look his best for the big night. truth be told, leslie is not so hot on the whole idea and she's not shy about it. >> honestly, i thought it was stupid. honestly. i still am not a huge fan of it but guess i'm getting diapers out of it? >> yes, you are. >> so -- >> reporter: the diapers in exchange for beer is a dadchelor party staple known as the diaper keg. >> i let everybody know what brand you wanted, what sizes you wanted. this is all for you. >> i'm sure it is. >> reporter: sure enough, dave's friends show up to the preparty armed not with budweiser or coors, but with hug guys and pampers. >> wow! wow! >> reporter: had you ever heard of a dadchelor party? >> no, this is the first one. >> reporter: it m