Like the time we "forgot" the gear down on a Tristar. Climbing out of ATL we received a call from ATC telling us that they had received a call that we had forgotten to raise the undercarriage, we hadn't, was only that we had hot brakes and needed to cool them off a bit before raising the gear. On taxi out, especially long ones, the L10 had a tendency for the brakes to get hot, at take off they were ok but after take they tended to get a bit hot so we had to use airflow to cool them down. The 343 without brake fans were similar, after retraction they would get hot so you needed to lower them again.
Sorry for adding to the thread creep.
NG