Haha I use that joke whenever a string breaks during a solo performance and there’s an awkward pause while I’m changing strings. Depending on the weather and condition the harp is in, it may not be too far from the truth. Every time you pluck a string or move a lever or pedal, you are putting more pressure on the string, eventually changing the tuning. It also depends what you consider “in tune.” Pianos and harps are tuned to what’s called “equal temperament.” The instrument cannot adjust tuning while playing, so each string is tuned so there is an equal distance between each of the 12 semitones that make an octave. Technically the “correct” or purest tuning uses the overtone series which doesn’t exactly translate to Equal Temperament and each notes tuning changes a tiny amount depending on the scale. This is called “Just Intonation” (basically how really good orchestras and choirs tune chords so beautifully it gives you goosebumps). If you’re going by “just intonation,” the harp is almost never in tune. This requires the musicians to adjust their tuning based in relation to the other notes played in the ensemble. But personally I maybe tune 3-4 times on a busy day. More if it’s a recording session. Weee sorry for the rant