If both of the storylines in this episode had been as good as the inappropriate gift, it would have been a definate ten.
Lily's grandmother's speech before the opening of the *you know what* was one of the funniest things we've seen so far on HIMYM, and I loved the look upon Lily's face when her older relatives all expressed such enthusiasm towards *it*. The telepathic conversation between the girls and it's unsuccessful outcome was another highlight.
The bachelor party storyline wasn't quite as amusing, but it's culmination with Barney, made it will worth it. (I will say no more, but it's one of the few times I think I've found him to be so likeable.)