Just browsing youtube...
Brent Spiner - Spot was stupid (http://www.youtube.com/watch?v=_pEiLpxzuCY#)
Sir Patrick Stewart heckling Brent Spiner (http://www.youtube.com/watch?v=F8ZLwjDQ0Fw#ws)
Brent Spiner crashes Patrick Stewart's Q&A panel (http://www.youtube.com/watch?v=EvJ7xR4D1ZI#ws)
Brent Spiner imitates Patrick Stewart... again. (http://www.youtube.com/watch?v=eQcammV9G1Y#)