The flip side of failing to recall an irregular form is tripping a false alarm for one when the verb is in fact regular. Word lookup is not instantaneous, and as it proceeds a few irregular verbs in memory might crudely match a regular probe. That could temporarily slow down the rule until the last jots and tittles of the word are properly matched and the false matches have petered out; only then will the rule be allowed to proceed unhindered.

Although milians and infinite numbers of them [fish] be taken, yet on the next [day] their losse will be so supplied with new store that nothing shall be missing of the yesterfang.

Come on you white maggot, that was a throw.

There was once upon a time a king, who had a daughter, and she was such an awful story-teller, that you couldn't find a greater anywhere.