The grin because you always seem to have one when I see you. Now, that may be because you tend to have 'had a vision' not long before. ;) Visions that are inevitably twisted (but amusing).
The Joker because, well, that skit was in one of my first Vaudville shows and you and Sherri did it so well I may always associate it with the both of you. I hope I do - it's a happy association.
The smoking jacket for obvious reasons (see 'grin') ;)
The costumes because you have come up with such excellent ones.
And Gus. Your invention of Gus is priceless. By the simple act of preserving a fungus (from a con) in a jar, you invented a unique set up for picture taking. As Gus is priceless, the pictures are more so (and heavy, yes) and that's a legacy to be proud of.
And then there is the fact that I can always come up to your booth at Ren Fest to tease you. :D
Thank you for being you, Jimmy!