Tense in PINs

Years ago I adopted the habit of giving myself incongruous little mnemonics to remember all the various PINs I was issued with by various banks, many of which I can still remember even though the cards and accounts they were associated with are long gone: "Heaven sits under the gate" (7618), for example, or "Hate to win several" (8217).

I haven't used any plastic for several weeks, and realised with a jerk yesterday that I wasn't at all sure of my newly-issued PIN. So I fell back on the mnemonic I'd devised, as usual, and discovered to my concern that it didn't work. Having come home and looked up the correct number, I realise that the reason why it didn't was that I'd got the tense of the verb wrong... which happens to make it sound like a different number! Perhaps I should try to come up with a less potentially ambiguous phrase -- but after this shock, I'll probably remember it :-p