frankenstein vs my little pony or when not to laugh

i 'm helping out a friend who owns a butcher/deli shop cut and wait on customers as i do on occasion. (he doesn't usually pay me but i do usually get some great steaks and stuff.) so anyway, the place is mobbed with people and i'm working at the cutting table trying to get a special order done before the guy comes in and one of the kitchen guys (skippy, who is a very nice guy but has some rough edges to him) has been drafted to help with customers. the guy upon whom he is waiting, a regular and has unbeknownst to him and me, has tourettes syndrome (not the swearing kind but the sometimes i can't control my actions kind.)
here's what happened
skippy - asks him what he wants
the guy - points to some sirloin steaks and mumbles something.
skippy - sirloin strips? how many
the guy - points to the steaks again and makes a frankenstein kinda noise (mmmmmmph)
me - at this point this event has really caught my attention and i'm being careful not to slice into any brian flesh
skippy - how many?
the guy - another frankenstein noise followed by a whinny noise and a head shake and horse blow sort of noise.
me - i am stunned. i've not witnessed this... ever. i know it would be wrong to laugh (out loud) so i don't. i try desperately to concentrate on what i am doing.
the guy- more frankenstein and horse noises now with added foot stamping
skippy - makes eye contact with me with a bewildered expression on his face
me - i try to make a subtle "i don't know what's happening here but i'm glad that you're waiting on him" type face back at skippy and pretend to go back to cutting
skippy - asks the guy "do you want to pick them out?"
the guy - points to the steaks whinnies and stomps his foot four times...
skippy - ever quick to react says... "four?"
they guy - whinnies and blows
skippy hands the guy his four steaks and pretending nothing out of the ordinary has happened moves to the next customer who is equally stunned.
me - i continue cutting, and sort of put everything into remission as i finish up the order.

some ten minutes later i walk back to the kitchen to see if i can get some lunch... skippy looks at me with the same face and it all comes back... seeing that i found that one of the funniest things that i have ever actually witnessed, i find myself doubled over laughing uncontrollably with my sides hurting and tears streaming from my eyes. now understand that i do not think that i am a mean person and i was not laughing at the guy or his condition but the circumstance itself, which was funny.... i think if it were me in the guy's place, i'm not sure but i might not mind too much if people found me funny as long as they weren't mean or hateful about it. i myself think that it is a gift to be able to make people laugh but i could see how the guy might think otherwise. thoughts?

dont be a stranger
brian