I think I've:
...been in this courtroom before: deja sue
...been on this airplane before: deja flew
...came up with this innovation before: deja new
...eaten this dinner before: deja stew
...expanded this way before: deja grew
...fed these pigeons before: deja coo
...felt this bad before: deja rue
...felt this sad before: deja blue
...forgotten this your name before: deja who
...had this feeling of deja vu before: deja too
...learned this stuff before: deja knew
...milked this cow before: deja moo
...pursued this person before: deja woo
...read this mystery book before: deja clue
...scared this person away before: deja boo
...seen these twins before: deja two
...seen this slime before: deja goo
...seen this strange animal before: deja gnu
...sketched this portrait before: deja drew
...smelled this bad odor before: deja phew
...used this beer recipe before: deja brew
...visited this menagerie before! : deja zoo
...waited in this line before: deja queue