Generally, though, at some point someone will say something to rile me enough that I lay my cards on the table.
Last night it was Sensei, who at the end of karate announced that if anyone was voting for ______'s bunch he was keeping us all in until the polling stations closed.
"Too late! Already done it!" I burst out.
(My current constituency is Lewisham West & Penge, which has been a safe seat for Labour since forever - this year Jim Dowd was ahead by more votes than the Conservative runner-up got - but I turned out because I always do, and to help keep the joke party, Liberty GB out. They got 44 votes.)