Catch comedian Pablo Francisco before he jets off for his European tour or gets too busy filming his Comedy Center special to spend any time onstage. Its not so much the punch lines that draw people to his shows; its Franciscos ability to impersonate famous characters thats made him popular. One bit has Francisco voicing a movie preview for a film that stars Arnold Schwarzenegger as a tortilla vendor talk about going against type! 8 p.m. Thursday, 8 and 10:30 p.m. Friday and Saturday, 7:30 p.m. Sunday. For information, call 713-333-8800 or visit www.improvhouston.com. $22.