Everybody who sees this should add their own. Here are mine:
– Made a very effective shrinking device and got lost in the master bedroom for two years fighting gargantuan mimmoths and nyar spiders.
– Went for a walk in the market in disguise (like you do), then got distracted by a blacksmith, fell in love, came back five years later expecting their seat to have been kept warm for them. And it was.
– Messed with time, went BACK in time a short period, avoided past self but due to flightiness continued avoidance for seven months after instigating incident.
Free space: We already know about the guy who stayed underground longer than necessary because he liked bat sandwiches.